fix video url in header menu (#883)

Author: Arhell

_layouts/bootstrap.html

@@ -90,7 +90,7 @@
                                         <li><h4>Guides</h4></li>
                                         {{ guides }}
                                         <li role="separator" class="divider"></li>
-                                        <li><a href="/video">Video</a></li>
+                                        <li><a href="/videos">Videos</a></li>
                                     </ul>
                                 </div>
                                 <div class="col-sm-5 col-md-6">