qunit: Remove promotion of unstable qunit-git.js

Remove this part of the interface, making it similar to PEP.

Ref qunitjs/qunit#1457.

Author: Krinkle

templates/qunit-git.hbs

@@ -2,8 +2,6 @@
 	"title": "QUnit - All Versions"
 }</script>
 
-{{include "qunit-git"}}
-
 <h2>QUnit - All Versions</h2>
 <ul>
 {{#each qunit.all}}