Add button: Buy me a coffee

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>