remove extra injections of jQuery that are no longer needed

All of the uses of jQuery via window have been removed. The only
remaining implicit use is the qtip2 module, which is covered by the
injection mechanism.

Author: haarg

root/static/js/cpan.js

@@ -1,5 +1,6 @@
 /* jshint white: true, lastsemic: true */
 
+const $ = require('jquery');
 const relatizeDate = require('./relatize_date.js');
 const storage = require('./storage.js');
 const Mousetrap = require('mousetrap');

root/static/js/inject.js

@@ -1,10 +1,5 @@
 import jQuery from 'jquery';
 
-window.$ = jQuery;
-window.jQuery = jQuery;
-
 export {
-    jQuery as default,
     jQuery,
-    jQuery as $,
 };