Remove social media links from mailing-lists page (#1032)

mailing-lists.php

@@ -124,13 +124,6 @@ if (isset($_POST['action'])) {
  <a href="http://marc.info/">Marc</a>.
 </p>
 
-<h2>Twitter</h2>
-<p>
- The PHP team maintains an official PHP.net account on twitter,
- <a href="https://twitter.com/official_php">@official_php</a>, for those
- interested in following news and other announcements from the PHP project.
-</p>
-
 <h2>Mailing List Posting guidelines</h2>
 
 <p>