Add link to discussion forum

gui/index.html

@@ -205,6 +205,7 @@ thead tr th {
     <div class="container">
         <p class="navbar-text">{{version}}</p>
         <ul class="nav navbar-nav navbar-right">
+            <li><a class="navbar-link" href="http://discourse.syncthing.net/">Support / Forum</a></li>
             <li><a class="navbar-link" href="https://github.com/calmh/syncthing/releases">Latest Release</a></li>
             <li><a class="navbar-link" href="https://github.com/calmh/syncthing/wiki">Documentation</a></li>
             <li><a class="navbar-link" href="https://github.com/calmh/syncthing/issues">Bugs</a></li>