Header: Remove "Try jQuery"

Try jQuery is no longer being offered. This commit works alongside
jquery/jquery.com@9ac15a4

Fixes jquery/jquery.com#176
Closes jquerygh-412

Author: therobinkim

themes/jquery/header.php

@@ -80,7 +80,6 @@
 					<li class="dropdown"><a href="https://jquery.org/support/">Support</a>
 						<ul>
 							<li><a href="https://learn.jquery.com/">Learning Center</a></li>
-							<li><a href="http://try.jquery.com/">Try jQuery</a></li>
 							<li><a href="https://irc.jquery.org/">IRC/Chat</a></li>
 							<li><a href="https://forum.jquery.com/">Forums</a></li>
 							<li><a href="https://stackoverflow.com/tags/jquery/info">Stack Overflow</a></li>