Revert "move `kubernetes` folder to the `k8s-unofficial` branch"

This reverts commit fe99a5948b.

kubernetes/README.md

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+# Uptime-Kuma K8s Deployment
+
+⚠ Warning: K8s deployment is provided by contributors. I have no experience with K8s and I can't fix error in the future. I only test Docker and Node.js. Use at your own risk.
+
+## How does it work?
+
+Kustomize is a tool which builds a complete deployment file for all config elements.
+You can edit the files in the ```uptime-kuma``` folder except the ```kustomization.yml``` until you know what you're doing.
+If you want to choose another namespace you can edit the ```kustomization.yml``` in the ```kubernetes```-Folder and change the ```namespace: uptime-kuma``` to something you like.
+
+It creates a certificate with the specified Issuer and creates the Ingress for the Uptime-Kuma ClusterIP-Service.
+
+## What do I have to edit?
+
+You have to edit the ```ingressroute.yml``` to your needs.
+This ingressroute.yml is for the [nginx-ingress-controller](https://kubernetes.github.io/ingress-nginx/) in combination with the [cert-manager](https://cert-manager.io/).
+
+- Host
+- Secrets and secret names
+- (Cluster)Issuer (optional)
+- The Version in the Deployment-File
+  - Update:
+    - Change to newer version and run the above commands, it will update the pods one after another
+
+## How To use
+
+- Install [kustomize](https://kubectl.docs.kubernetes.io/installation/kustomize/)
+- Edit files mentioned above to your needs
+- Run ```kustomize build > apply.yml```
+- Run ```kubectl apply -f apply.yml```
+
+Now you should see some k8s magic and Uptime-Kuma should be available at the specified address.

kubernetes/kustomization.yml

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+namespace: uptime-kuma
+namePrefix: uptime-kuma-
+
+commonLabels:
+  app: uptime-kuma
+
+bases:
+   - uptime-kuma
+
+

kubernetes/uptime-kuma/deployment.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    component: uptime-kuma
+  name: deployment
+spec:
+  selector:
+    matchLabels:
+      component: uptime-kuma
+  replicas: 1
+  strategy:
+    type: Recreate
+
+  template:
+    metadata:
+      labels:
+        component: uptime-kuma
+    spec:
+      containers:
+        - name: app
+          image: louislam/uptime-kuma:1
+          ports:
+            - containerPort: 3001
+          volumeMounts:
+            - mountPath: /app/data
+              name: storage
+          livenessProbe:
+            exec:
+              command:
+                - node
+                - extra/healthcheck.js
+            initialDelaySeconds: 180
+            periodSeconds: 60
+            timeoutSeconds: 30
+          readinessProbe:
+            httpGet:
+              path: /
+              port: 3001
+              scheme: HTTP
+
+      volumes:
+        - name: storage
+          persistentVolumeClaim:
+            claimName: pvc

kubernetes/uptime-kuma/ingressroute.yml

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+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  annotations:
+    kubernetes.io/ingress.class: nginx
+    cert-manager.io/cluster-issuer: letsencrypt-prod
+    nginx.ingress.kubernetes.io/proxy-read-timeout: "3600"
+    nginx.ingress.kubernetes.io/proxy-send-timeout: "3600"
+    nginx.ingress.kubernetes.io/server-snippets: |
+      location / {
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_http_version 1.1;
+        proxy_set_header X-Forwarded-Host $http_host;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header X-Forwarded-For $remote_addr;
+        proxy_set_header Host $host;
+        proxy_set_header Connection "upgrade";
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header   Upgrade $http_upgrade;
+        proxy_cache_bypass $http_upgrade;
+        }
+  name: ingress
+spec:
+  tls:
+  - hosts:
+    - example.com
+    secretName: example-com-tls
+  rules:
+  - host: example.com
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: service
+            port:
+              number: 3001

kubernetes/uptime-kuma/kustomization.yml

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+resources:
+  - deployment.yml
+  - service.yml
+  - ingressroute.yml
+  - pvc.yml

kubernetes/uptime-kuma/pvc.yml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: pvc
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 4Gi

kubernetes/uptime-kuma/service.yml

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+apiVersion: v1
+kind: Service
+metadata:  
+  name: service
+spec:
+  selector:    
+    component: uptime-kuma
+  type: ClusterIP
+  ports:  
+  - name: http
+    port: 3001
+    targetPort: 3001
+    protocol: TCP