Update links list

- Changed Forgejo link text.
- Removed link to Codeberg profile.
- Added link to Mastodon profile.

index.tsx

@@ -32,10 +32,10 @@ export default function({ comp }) {
         <p>Other places where you can find me:</p>
         <ul>
           <li>
-            <a href="https://code.fosterhangdaan.com/foster" target="_blank">My Forgejo instance</a>
+            <a href="https://code.fosterhangdaan.com/foster" target="_blank">Forgejo</a>
           </li>
           <li>
-            <a href="https://codeberg.org/foster-hangdaan" target="_blank">Codeberg</a>
+            <a href="https://mastodon.online/@foster" target="_blank">Mastodon</a>
           </li>
         </ul>
       </section>