Add rel=me to verify mastodon profile url

Author: jwheare

_layouts/default.html

@@ -64,7 +64,7 @@
             </a></li>
             <li class="iconsep"><a href="{{ site.github.owner_url }}"><span class="fa-brands fw-fw fa-github"></span></a></li>
             <li class="iconsep"><a href="https://twitter.com/ircv3"><span class="fa-brands fw-fw fa-twitter"></span></a></li>
-            <li class="iconsep"><a href="https://mastodon.social/@ircv3"><span class="fa-brands fw-fw fa-mastodon"></span></a></li>
+            <li class="iconsep"><a href="https://mastodon.social/@ircv3" rel="me"><span class="fa-brands fw-fw fa-mastodon"></span></a></li>
           </ul>
         </div>
       </div>