Add Mastodon link tag to head

Author: razor-x

themes/default/layouts/partials/head.html

@@ -11,3 +11,4 @@
   content="Copyright (c) 2013-{{ now.Format "2006"}} {{ site.Params.author }}.">
 <meta name="owner" content="{{ site.Params.author }}">
 <link rel="author" href="humans.txt" type="text/plain">
+<link rel="me" href="https://mastodon.social/@evansosenko">