remove old summit banner (#3131)

Author: samccann

docs/docsite/.templates/banner.html

@@ -17,13 +17,13 @@
       /*use extra_banner for when we want something extra, like a survey or Community Day notice */
       var extra_banner = '';
 
-      var extra_banner =
+      /* var extra_banner =
       '<div id="latest_extra_banner_id" class="admonition important">' +
         '<p style="padding-bottom: 1.2rem;text-align: center;">' +
         'Slides for those who attended AnsibleFest at <a href="https://www.redhat.com/en/summit?sc_cid=RHCTG1250000442936">Red Hat Summit</a> will be available soon.' +
         '</p>' +
       '</div>';
-    
+    */
     // Create a banner if we're not on the official docs site
     if (location.host == "docs.testing.ansible.com") {
       document.write('<div id="testing_banner_id" class="admonition important">' +