Add a link to our linkedin page

Author: vgvassilev

_includes/header.html

@@ -45,6 +45,7 @@
           <li class="dropdown-item"> <a class="nav-link" href="/vacancies">Openings</a></li>
           <li class="dropdown-item"> <a class="nav-link" href="/meetings">Meetings</a></li>
           <li class="dropdown-item"> <a class="nav-link" href="/open_projects">Open Projects</a></li>
+          <li class="dropdown-item"> <a class="nav-link" target="_blank" href="https://www.linkedin.com/groups/9579649/">Follow Us</a></li>
         </ul>
       </li>
       <li class="nav-item">