Revert "Add github contribute link to footer of all qunitjs.com pages. Closes gh-189"

This reverts commit 34b1299. See discussion in #189

Author: jzaefferer

themes/qunitjs.com/content-page.php

@@ -18,11 +18,3 @@ a {
 	border: 1px solid #ccc;
 	border-radius: 5px;
 }
-
-.github-feedback {
-	margin-top: 1.5em;
-}
-
-.icon-github {
-	color: #FFF;
-}