docs: update social handle from Twitter to X (twitter.com -> x.com)

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -1104,4 +1104,4 @@ Your contributions are always welcome! Please take a look at the [contribution g
 
 ---
 
-If you have any question about this opinionated list, do not hesitate to contact [@VintaChen](https://twitter.com/VintaChen) on Twitter.
+If you have any question about this opinionated list, do not hesitate to contact [@vinta](https://x.com/vinta) on X (Twitter).

website/templates/base.html

@@ -75,11 +75,8 @@
           >GitHub</a
         >
         <span class="footer-sep">/</span>
-        <a
+        <a href="https://x.com/vinta" target="_blank" rel="noopener"
-          href="https://twitter.com/vinta"
+          >X (Twitter)</a
-          target="_blank"
-          rel="noopener"
-          >Twitter</a
         >
       </div>
     </footer>