Explicitly set JQuery globals on main site (#9877)

I guess this is related to the jquery update from #9861,
or maybe this line wasn't working and we were relying
in something else?

Not sure why I didn't notice this before,
maybe my browser cache :(

Ref #9861

Author: stsewd

readthedocs/templates/base.html

@@ -67,7 +67,9 @@
   <script src="{% static 'vendor/jquery-migrate.js' %}"></script>
   <script src="{% static 'vendor/jquery-ui.js' %}"></script>
   <script >
-    require('jquery');
+    // Set jQuery to its expected globals.
+    window.$ = require('jquery');
+    window.jQuery = window.$;
   </script>
 
   <script src="{% static 'javascript/base.js' %}"></script>