Feature/add buy me a coffee badge to about page (#1422)

* Add button: Buy me a coffee

* Update changelog

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Added
+
+- Added the _Buy me a coffee_ button to the about page
+
 ### Changed
 
 - Improved the usage of the premium indicator component

apps/client/src/app/pages/about/about-page.html

@@ -96,6 +96,20 @@
             title="Ghostfolio is an independent & bootstrapped business"
           ></div>
         </div>
+        <div
+          *ngIf="!hasPermissionForSubscription"
+          class="d-flex justify-content-center"
+        >
+          <a
+            href="https://www.buymeacoffee.com/ghostfolio"
+            target="_blank"
+            title="Support Ghostfolio"
+            ><img
+              class="mb-2"
+              src="../assets/images/button-buy-me-a-coffee.png"
+              width="180"
+          /></a>
+        </div>
       </div>
     </div>
   </div>