Add button to send test notification

internal/web/public/js/notify.js

@@ -0,0 +1,5 @@
+async function testNotifications() {
+
+    const url = '/api/test_notify'
+    await fetch(url, { method: 'post' })
+}

internal/web/templates/config.html

@@ -44,6 +44,7 @@
                 </tr>
                 <tr>
                   <td><button type="submit" class="btn btn-primary">Save</button></td>
+                  <td><button type="button" style="float: right;" class="btn btn-success" onclick="testNotifications()">Test notifications</button></td>
                   <td></td>
                 </tr>
               </form>
@@ -199,6 +200,7 @@
       </div>
     </div>
   </div>      
+  <script src="/fs/public/js/notify.js"></script>
 
 {{ template "footer.html" }}
 {{ end }}