add party pictures, fix order of documents, add new css file

_includes/nav.html

@@ -1,4 +1,4 @@
-<nav class="navbar navbar-default navbar-fixed-bottom">
+<nav class="navbar navbar-inverse navbar-fixed-bottom">
   <div class="container-fluid">
     <div class="navbar-header">
       <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
@@ -23,8 +23,8 @@
         {% endfor %}
       </ul>
       <ul class="nav navbar-nav navbar-right">
-        <li><a href="https://eurom.at">EUromat</a></li>
-        <li><a href="https://jef-sachsen.de/impressum/">Impressum</a></li>
+        <li><a href="https://eurom.at">EUromat <i class="fa fa-external-link" aria-hidden="true"></i></a></li>
+        <li><a href="https://jef-sachsen.de/impressum/">Impressum <i class="fa fa-external-link" aria-hidden="true"></i></a></li>
       </ul>
     </div>
   </div>