Fix toggling sidebar on mobile in admin pages

app/javascript/flavours/glitch/packs/admin.js

@@ -1,10 +1,5 @@
 import 'packs/public-path';
-import loadPolyfills from 'flavours/glitch/util/load_polyfills';
 import ready from 'flavours/glitch/util/ready';
-import loadKeyboardExtensions from 'flavours/glitch/util/load_keyboard_extensions';
-
-function main() {
-  const { delegate } = require('@rails/ujs');
 
 ready(() => {
   const React    = require('react');
@@ -27,22 +22,3 @@ function main() {
     });
   });
 });
-
-  delegate(document, '.sidebar__toggle__icon', 'click', () => {
-    const target = document.querySelector('.sidebar ul');
-
-    if (target.style.display === 'block') {
-      target.style.display = 'none';
-    } else {
-      target.style.display = 'block';
-    }
-  });
-}
-
-loadPolyfills()
-  .then(main)
-  .then(loadKeyboardExtensions)
-  .catch(error => {
-    console.error(error);
-
-  });