[WarpMain] Added mattermost and gitlab to support section in about page

www/web/warpmain/templates/warpmain/about.html

@@ -21,10 +21,26 @@
 
     <h3>{% trans "support" %}</h3>
     <p>{% trans "support_text"%}</p>
+    <a href="https://mattermost.warpzone.ms/warpzone/channels/infrastruktur" style="text-decoration: none;">
+        <button type="button" class="btn btn-default">
+            <span class="glyphicon glyphicon-user" aria-hidden="true"></span> {% trans "mattermost_channel" %}
+        </button>
+    </a><br /><br />
+   
     <a href="mailto:info@draysen.de" style="text-decoration: none;">
         <button type="button" class="btn btn-default">
             <span class="glyphicon glyphicon-envelope" aria-hidden="true"></span> info@draysen.de
         </button>
+    </a><br /><br />
+    <a href="https://gitlab.warpzone.ms/infrastruktur/warpinfra/issues" style="text-decoration: none;">
+        <button type="button" class="btn btn-default">
+            <span class="glyphicon glyphicon-fire" aria-hidden="true"></span> {% trans "issue_tracker" %}
+        </button>
+    </a>
+    <a href="https://gitlab.warpzone.ms/infrastruktur/warpinfra/issues" style="text-decoration: none;">
+        <button type="button" class="btn btn-default">
+            <span class="glyphicon glyphicon-fire" aria-hidden="true"></span> {% trans "issue_tracker" %}
+        </button>
     </a>
     <br>
     <br>