layouts: update index footer.

Author: micrypt

_layouts/index.html

@@ -79,7 +79,7 @@ <h2 class="title">About</h2>
 				<div>
 					<div id="links">
 						<ul>
-							<li><a href="https://twitter.com/micrypt" id="twitter" rel="me">Twitter</a></li>						
+							<li><a href="https://mastodon.social/@micrypt" id="mastodon" rel="me">Mastodon</a></li>						
 							<li><a href="http://www.flickr.com/micrypt" id="flickr" rel="me">Flickr</a></li>						
 							<li><a href="http://micrypt.tumblr.com/" id="tumblr" rel="me">Tumblr</a></li>														
 						</ul>