Add GitLab link in footer (#406)

* Add GitLab link in the footer

* add gitlab icon in the footer

Author: thewasif

index.html

@@ -588,6 +588,7 @@ <h1>How Can I Participate in FOSSASIA projects?</h1>
 								<li><a target="_self" href="https://www.flickr.com/photos/fossasia"><i class="icon social_flickr icon-large"></i></a></li>
                 				<li><a target="_self" href="https://www.instagram.com/explore/tags/fossasia/"><i class="icon social_instagram"></i></a></li>
 								<li><a target="_self" href="https://github.com/fossasia"><i class="fa fa-github fa-lg"></i></a></li>
+								<li><a target="_self" href="https://gitlab.com/fossasia"><i class="fa fa-gitlab fa-lg"></i></a></li>
 							</ul>
 						</div>
 					</div>