discourse -> forum

gui/index.html

@@ -417,7 +417,7 @@
     <div class="container">
       <ul class="nav navbar-nav">
         <li><a class="navbar-link" href="https://github.com/syncthing/syncthing/wiki" target="_blank"><span class="glyphicon glyphicon-book"></span>&ensp;<span translate>Documentation</span></a></li>
-        <li><a class="navbar-link" href="https://discourse.syncthing.net" target="_blank"><span class="glyphicon glyphicon-question-sign"></span>&ensp;<span translate>Support</span></a></li>
+        <li><a class="navbar-link" href="https://forum.syncthing.net" target="_blank"><span class="glyphicon glyphicon-question-sign"></span>&ensp;<span translate>Support</span></a></li>
         <li><a class="navbar-link" href="https://github.com/syncthing/syncthing/releases" target="_blank"><span class="glyphicon glyphicon-info-sign"></span>&ensp;<span translate>Changelog</span></a></li>
         <li><a class="navbar-link" href="https://github.com/syncthing/syncthing/issues" target="_blank"><span class="glyphicon glyphicon-warning-sign"></span>&ensp;<span translate>Bugs</span></a></li>
         <li><a class="navbar-link" href="https://github.com/syncthing/syncthing" target="_blank"><span class="glyphicon glyphicon-wrench"></span>&ensp;<span translate>Source Code</span></a></li>