resolve modification request https://github.com/butlerx/wetty/pull/242#discussion_r407240068

docs/atoz.md

@@ -8,22 +8,22 @@ You will need the package `build-essential` to be installed. We need this specif
 
 As the `root` user run these commands:
 
-~~~bash
+```bash
 apt update
 apt install -y build-essential
-~~~
+```
 
 If you do not have root access and just want to check the dependency is installed you can use this command:
 
-~~~bash
+```bash
 dpkg -s build-essential | grep Status:
-~~~
+```
 
 If the program is installed you will see this result:
 
-~~~bash
+```bash
 Status: install ok installed
-~~~
+```
 
 ### Create a local user account
 
@@ -35,9 +35,9 @@ If you need to create a local user account you can run this command:
 
 **Important note:** replace `username` with a user name of your choosing and create a password when prompted
 
-~~~bash
+```bash
 adduser --gecos "" username
-~~~
+```
 
 Switch to your local user now and open an `ssh` session to continue with this guide.
 
@@ -45,30 +45,30 @@ Switch to your local user now and open an `ssh` session to continue with this gu
 
 To install and manage `node` as a local user we are going to use [Node Version Manager](https://github.com/nvm-sh/nvm) as an established solution to installing and managing multiple versions of node without needing `root` access. We are going to install the `lts` or long term support release of `node` to use with this application.
 
-~~~bash
+```bash
 bash <(curl -s https://raw.githubusercontent.com/nvm-sh/nvm/master/install.sh) && source ~/.profile
 nvm install --lts
-~~~
+```
 
 You can now call `node` to check it works using this command. 
 
-~~~bash
+```bash
 node -v
-~~~
+```
 
 Your result should look something like this.
 
-~~~bash
+```bash
 v12.16.2
-~~~
+```
 
 **Note:** There is consideration with this method. `node` is only in the local user's path through sourcing of the `~/.nvm/nvm.sh` via the users `.bashrc` file. Unless this is done `node` will not be usable unless directly linked to and `nvm` commands will be unavailable. 
 
 The way we over come this issue for the needs of this guide is by using this command where applicable:
 
-~~~bash
+```bash
 source ~/.nvm/nvm.sh && nvm which 12
-~~~
+```
 
 **Why?** This command will always provide us with the path to the most current version of `node 12` installed via `nvm` regardless of other versions of `node` installed.
 
@@ -78,25 +78,25 @@ source ~/.nvm/nvm.sh && nvm which 12
 
 Make the required directory using this command:
 
-~~~bash
+```bash
 mkdir -p ~/.ssl
-~~~
+```
 
 Generate the self signed `openssl` certificates we will use to encrypt our web traffic when using `wetty` using this command:
 
 **Note:** we are using`ecdsa` using the `secp521r1` curve.
 
-~~~bash
+```bash
 openssl req -x509 -nodes -days 1095 -newkey ec:<(openssl ecparam -name secp521r1) -subj "/C=GB/ST=None/L=None/O=None/OU=None/CN=None" -out ~/.ssl/wetty.crt -keyout ~/.ssl/wetty.key
-~~~
+```
 
 Now give these file and folders the correct permissions using these commands:
 
-~~~bash
+```bash
 chmod 700 ~/.ssl
 chmod 644 ~/.ssl/wetty.crt 
 chmod 600 ~/.ssl/wetty.key
-~~~
+```
 
 This is all we need to do for now in regards to https.
 
@@ -106,37 +106,37 @@ This is all we need to do for now in regards to https.
 
 Make the required directory, if it does not exist, using this command:
 
-~~~bash
+```bash
 mkdir -p ~/.ssh
-~~~
+```
 
 Create the `ssh` private key using `ed25519` that we need to authorise our local connection, using this command:
 
-~~~bash
+```bash
 ssh-keygen -q -C "wetty-keyfile" -t ed25519 -N '' -f ~/.ssh/wetty 2>/dev/null <<< y >/dev/null
-~~~
+```
 
 **Important Note:** You must add the public key to your `authorized_keys` file in order to be able to log in using your `ssh` key file when accessing `wetty` via a web browser.
 
 Copy the key to our `~/.ssh/authorized_keys` file, using this command:
 
-~~~bash
+```bash
 cat ~/.ssh/wetty.pub >> ~/.ssh/authorized_keys
-~~~
+```
 
 Now give these file and folders the correct permissions, using these commands:
 
-~~~bash
+```bash
 chmod 700 ~/.ssh
 chmod 644 ~/.ssh/authorized_keys
 chmod 600 ~/.ssh/wetty
-~~~
+```
 
 **Optional:** A housekeeping command. If you need to remove all entries of the `wetty` public key with the comment `wetty-keyfile` from the `~/.ssh/authorized_keys` file use this command. Otherwise ignore this.
 
-~~~bash
+```bash
 sed -r '/^ssh-ed25519(.*)wetty-keyfile$/d' -i ~/.ssh/authorized_keys
-~~~
+```
 
 ### Install wetty
 
@@ -146,30 +146,30 @@ As your local user run these commands to install `wetty` and `forever`. We will
 
 First, we need to make sure the local user's `~/bin` folder exists and is in the `PATH` for the following commands to work.
 
-~~~bash
+```bash
 mkdir -p ~/bin && source ~/.profile
-~~~
+```
 
 Please use either the `npm` or `yarn` method and not both. The `yarn` method is recommended but I provide both as you may have a personal preference. The outcome is effectively the same.
 
-`npm `  - optional - use `npm` to install wetty
+`npm ` - optional - use `npm` to install wetty
 
-~~~bash
+```bash
 npm install -g wetty forever --prefix ~/
-~~~
+```
 
 `yarn` -  recommended - use `yarn` to install wetty
 
-~~~bash
+```bash
 npm install -g yarn --prefix ~/
 yarn global add wetty forever --prefix ~/
-~~~
+```
 
 Once successfully installed the application should be available in your local user's `PATH`. To test the installation was successful please use this command:
 
-~~~bash
+```bash
 wetty -h
-~~~
+```
 
 ### Accessing the web interface.
 
@@ -177,9 +177,9 @@ This needs to be done here because it is not easy to do in the next steps if `we
 
 This command will generate the correct URL you need to visit after using the start up commands in the following section.
 
-~~~bash
+```bash
 echo https://$(curl -s4 icanhazip.com):3000
-~~~
+```
 
 *Please make make a note of this URL now.*
 
@@ -191,23 +191,23 @@ For example, the below command would provide a `https` instance with automatic `
 
 **Important note:** This command will run in your current terminal session and not in the background.
 
-~~~bash
+```bash
 wetty --host 0.0.0.0 -p 3000 --title wetty --base / --sshkey ~/.ssh/wetty --sshhost localhost --sshuser $(whoami) --sshport 22 --sshauth publickey --sslkey ~/.ssl/wetty.key --sslcert ~/.ssl/wetty.crt
-~~~
+```
 
 #### forever to manage wetty
 
 Now you can use `forever` we installed to run `wetty` in the background instead of directly in your terminal
 
-~~~bash
+```bash
 forever start ~/bin/wetty --host 0.0.0.0 -p 3000 --title wetty --base / --sshkey ~/.ssh/wetty --sshhost localhost --sshuser $(whoami) --sshport 22 --sshauth publickey --sslkey ~/.ssl/wetty.key --sslcert ~/.ssl/wetty.crt
-~~~
+```
 
 To stop `wetty` from running you can use this command
 
-~~~bash
+```bash
 forever stop ~/bin/wetty
-~~~
+```
 
 #### Optional - config file.
 
@@ -217,49 +217,49 @@ Since `wetty` does not have configurations files and all commands are passed as
 
 Create a directory to store our configuration data using this command:
 
-~~~bash
+```bash
 mkdir -p ~/.config/wetty
-~~~
+```
 
 Now populate our `config` file with some settings. This examples is the same command as above.
 
-~~~bash
+```bash
 echo -n '--host 0.0.0.0 -p 3000 --title wetty --base / --sshkey ~/.ssh/wetty --sshhost localhost --sshuser $(whoami) --sshport 22 --sshauth publickey --sslkey ~/.ssl/wetty.key --sslcert ~/.ssl/wetty.crt' > ~/.config/wetty/config
-~~~
+```
 
 This configuration file is now available here for you to manage your settings.
 
-~~~bash
+```bash
 ~/.config/wetty/config
-~~~
+```
 
 Now we can load this file as part of the command we pass to `wetty` with shell expansion and command substitution.
 
-~~~bash
+```bash
 wetty $(eval echo $(cat ~/.config/wetty/config))
-~~~
+```
 
 #### forever using a config file
 
 Now you can use `forever` to run it in the background instead of directly in your terminal
 
-~~~bash
+```bash
 forever start ~/bin/wetty $(eval echo $(cat ~/.config/wetty/config))
-~~~
+```
 
 To stop `wetty` from running you can use this command:
 
-~~~bash
+```bash
 forever stop ~/bin/wetty
-~~~
+```
 
 #### Environment settings explained
 
 Let's break it down so that we can understand what's being done and why.
 
-~~~bash
+```bash
 --host 0.0.0.0 -p 3000 --title wetty --base /
-~~~
+```
 
 `--host 0.0.0.0` - defines the interface we want to bind to. Using `0.0.0.0` means that we bind to all available interfaces so using this setting just works. When we use nginx we can change this to `--host 127.0.0.1` in order to prevent generic port access to the application and force traffic through our nginx reverse proxy URL.
 
@@ -273,9 +273,9 @@ Let's break it down so that we can understand what's being done and why.
 
 These settings are all specific to `ssh` and will enable you to automatically log into you ssh session for the selected user.
 
-~~~bash
+```bash
 --sshkey ~/.ssh/wetty --sshhost localhost --sshuser $(whoami) --sshport 22 --sshauth publickey
-~~~
+```
 
 `--sshkey ~/.ssh/wetty` - we are telling `wetty` to load our `ssh` key file that we generated earlier.
 
@@ -291,9 +291,9 @@ These settings are all specific to `ssh` and will enable you to automatically lo
 
 These settings are specific to `openssl` to make `wetty` load https webserver so that all data is transmitted over a secure connection.
 
-~~~bash
+```bash
 --sslkey ~/.ssl/wetty.key --sslcert ~/.ssl/wetty.crt
-~~~
+```
 
 `--sslkey ~/.ssl/wetty.key` - tells `wetty` to load our `openssl` generated key file.
 
@@ -305,9 +305,9 @@ We will use a local user `systemd` service file to manage the `wetty` service.
 
 First, create the required directory, if it does not exist.
 
-~~~bash
+```bash
 mkdir -p ~/.config/systemd/user
-~~~
+```
 
 #### Systemd service.
 
@@ -315,13 +315,13 @@ Here is a normal service file template with hardcoded values you can insert into
 
 Use `nano` to open the file for editing.
 
-~~~
+```
 nano ~/.config/systemd/user/wetty.service
-~~~
+```
 
 The copy and paste this code.
 
-~~~bash
+```bash
 [Unit]
 Description=wetty
 After=network.target
@@ -337,7 +337,7 @@ RestartSec=2
 
 [Install]
 WantedBy=multi-user.target
-~~~
+```
 
 Press `ctrl` + `x` and then press `y` to save then press `enter` to confirm and exit `nano`.
 
@@ -347,13 +347,13 @@ Here is the example using our pseudo configuration file. All modifications to th
 
 Use `nano` to open the file for editing.
 
-~~~bash
+```bash
 nano ~/.config/systemd/user/wetty.service
-~~~
+```
 
 The copy and paste this code.
 
-~~~bash
+```bash
 [Unit]
 Description=wetty
 After=network.target
@@ -369,7 +369,7 @@ RestartSec=2
 
 [Install]
 WantedBy=multi-user.target
-~~~
+```
 
 Press `ctrl` + `x` and then press `y` to save then press `enter` to confirm and exit `nano`.
 
@@ -377,15 +377,15 @@ Press `ctrl` + `x` and then press `y` to save then press `enter` to confirm and
 
 The you can enable and start your service.
 
-~~~bash
+```bash
 systemctl --user enable --now wetty
-~~~
+```
 
 #### Managing your services
 
 These commands will help you manage your service.
 
-~~~bash
+```bash
 systemctl --user daemon-reload
 systemctl --user status wetty
 systemctl --user start wetty
@@ -393,7 +393,7 @@ systemctl --user stop wetty
 systemctl --user restart wetty
 systemctl --user disable --now wetty
 systemctl --user enable --now wetty
-~~~
+```
 
 ### Nginx reverse proxy
 
@@ -403,15 +403,15 @@ Please modify these specific environment settings:
 
 **Why?** This will disable generic port access to the application and force traffic via the nginx reverse proxy. 
 
-~~~bash
+```bash
 --host 127.0.0.1
-~~~
+```
 
 **Why?** This change is so that our application does not attempt to load as the web root of `/` for nginx.
 
-~~~bash
+```bash
 --base /wetty/
-~~~
+```
 
 Now you can use this nginx configuration file.
 
@@ -419,7 +419,7 @@ Now you can use this nginx configuration file.
 
 The copy and paste this into the `https` server block of your enable server configuration file.
 
-~~~nginx
+```nginx
 location /wetty {
     proxy_pass https://127.0.0.1:3000/wetty;
     #
@@ -444,29 +444,29 @@ location /wetty {
     proxy_redirect off;
     proxy_buffering off;
 }
-~~~
+```
 
 Press `ctrl` + `x` and then press `y` to save then press `enter` to confirm and exit `nano`
 
 Now you would need to reload nginx service using this command:
 
-~~~bash
+```bash
 systemctl restart nginx
-~~~
+```
 
 #### Accessing the web interface via nginx
 
 Visit the URL format `https://YourIP/wetty` and you can access `wetty`. This command will generate the correct URL you need to visit.
 
-~~~bash
+```bash
 echo https://$(curl -s4 icanhazip.com)/wetty
-~~~
+```
 
 ### Configuration  reference
 
 `wetty -h` configuration options for reference.
 
-~~~bash
+```bash
   --help, -h      Print help message                                   [boolean]
   --version       Show version number                                  [boolean]
   --sslkey        path to SSL key                                       [string]
@@ -484,4 +484,4 @@ echo https://$(curl -s4 icanhazip.com)/wetty
   --host          wetty listen host                [string] [default: "0.0.0.0"]
   --command, -c   command to run in shell            [string] [default: "login"]
   --bypasshelmet  disable helmet from placing security restrictions [boolean] [default: false]
-~~~
+```