Links on main page and design fix

_includes/header.html

@@ -25,6 +25,7 @@
         <li><a href="https://wiki.chaospott.de">Wiki</a></li>
         <li class="divider-vertical"></li>
         <li><a href="https://podcast.chaospott.de">Podcast</a></li>
+        <li><a href="https://chaospott.de/calendar.html">Termine</a></li>
       </ul>
       <ul class="nav navbar-nav navbar-right">
         <script>