Add support e-mail link

client/src/components/ContentNavigation.vue

@@ -23,6 +23,10 @@
       </router-link>
     </div>
 
+    <div class="top-navigation__item">
+      <a class="top-navigation__link" href="mailto:rahel.wenger@hep-verlag.ch">Supportanfragen</a>
+    </div>
+
   </nav>
 </template>
 
@@ -89,9 +93,11 @@
           order: 3;
           border-bottom: 0;
         }
+
         &:nth-child(2) {
           order: 1;
         }
+
         &:nth-child(3) {
           order: 2;
         }