Added Mastodon early too

Author: egonw

src/index.html

@@ -291,6 +291,7 @@ <h4 class="card-title"><i class="fa fa-comments"></i>&nbsp;Keep updated</h4>
                 <div class="card-footer">
                   <small>
                     <a target="_blank" href="https://github.com/cdk"><i class="fa fa-github"></i> GitHub</a>&emsp;
+                    <a target="_blank" href="https://fosstodon.org/@cdk"><i class="fa fa-mastodon"></i> Mastodon</a>&emsp;
                     <a target="_blank" href="https://twitter.com/the_cdk"><i class="fa fa-twitter"></i> Twitter</a>&emsp;
                   </small>
                 </div>