update twitter to the new URL and logo (pandas-dev#60382)

Author: partev

web/pandas/index.html

@@ -83,8 +83,8 @@ <h4>Follow us</h4>
                             </a>
                         </li>
                         <li class="list-inline-item">
-                            <a href="https://twitter.com/pandas_dev/">
-                                <i class="follow-us-button fab bi bi-twitter"></i>
+                            <a href="https://x.com/pandas_dev">
+                                <i class="follow-us-button fab bi bi-twitter-x"></i>
                             </a>
                         </li>
                     </ul>