Add logos in about page

about.md

@@ -34,13 +34,16 @@ We work on great tools and hardware for photographers, making beautiful pictures
 
 
 <div align=center>
-  <a href="http://github.com/ffreling">
-    <i class="fa fa-github-square fa-3x"></i>
-  </a>
   <a href="http://twitter.com/freling">
-    <i class="fa fa-twitter-square fa-3x"></i>
+    <img src="/images/twitter_logo.png" alt="Twitter" style="height:40px;">
+  </a>
+  <a href="http://gitlab.com/ffreling">
+    <img src="/images/gitlab_logo.png" alt="GitLab" style="height:40px;">
+  </a>
+  <a href="http://github.com/ffreling">
+    <img src="/images/github_logo.png" alt="GitHub" style="height:40px;">
   </a>
   <a href="http://fr.linkedin.com/in/ffreling">
-    <i class="fa fa-linkedin-square fa-3x"></i>
+    <img src="/images/linkedin_logo.png" alt="LinkedIn" style="height:40px;">
   </a>
 </div>