[WarpMain] Fixed small issue with about page

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

@@ -37,11 +37,6 @@
             <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>
     <br>