Add "close" button to shutdown the server

pkg/dashboard/static/index.html

@@ -47,6 +47,7 @@
                     <label for="cluster" style="margin-top: 0.5rem">K8s Context:</label>
                     <select id="cluster" class="form-control"></select>
                 </form>
+                <i class="btn fa fa-power-off text-muted" title="Shut down the Helm Dashboard application"></i>
             </div>
         </div>
     </nav>

pkg/dashboard/static/scripts.js

@@ -346,4 +346,13 @@ function showResources(namespace, chart, revision) {
 
         }
     })
-}
+}
+
+$(".fa-power-off").click(function () {
+    $.ajax({
+        url: "/",
+        type: 'DELETE',
+    }).done(function () {
+        window.close();
+    })
+})