add mastodon to contact details

index.html

@@ -113,6 +113,7 @@ This is a <a href="https://ntfy.sh/">ntfy</a> instance configured to be used as
 <table>
     <tr><td>Matrix</td><td><a href="https://matrix.to/#/@lub:imninja.net">@lub:imninja.net</a><br></td></tr>
     <tr><td>Email</td><td><a href="mailto:website@lubiland.de">website@lubiland.de</a></td></tr>
+    <tr><td>Mastodon</td><td><a rel="me" href="https://chaos.social/@lub">@lub@chaos.social</a></td></tr>
 </table>