Remove vestigial traces of the obsolete GitLab UI help page

app/assets/javascripts/pages/help/ui/index.js

-import initUIKit from '~/ui_development_kit';
-
-initUIKit();

app/assets/javascripts/ui_development_kit.js

-import $ from 'jquery';
-import initDeprecatedJQueryDropdown from '~/deprecated_jquery_dropdown';
-import Api from './api';
-
-export default () => {
-  initDeprecatedJQueryDropdown($('#js-project-dropdown'), {
-    data: (term, callback) => {
-      Api.projects(
-        term,
-        {
-          order_by: 'last_activity_at',
-        },
-        (data) => {
-          callback(data);
-        },
-      );
-    },
-    text: (project) => project.name_with_namespace || project.name,
-    selectable: true,
-    fieldName: 'author_id',
-    filterable: true,
-    search: {
-      fields: ['name_with_namespace'],
-    },
-    id: (data) => data.id,
-    isSelected: (data) => data.id === 2,
-  });
-};

app/controllers/help_controller.rb

@@ -59,10 +59,6 @@ class HelpController < ApplicationController
     @instance_configuration = InstanceConfiguration.new
   end
 
-  def ui
-    @user = User.new(id: 0, name: 'John Doe', username: '@johndoe')
-  end
-
   private
 
   def path_params