Align project files with CodeHarbor

Since both projects are developed together and by the same team, we also want to have the same code structure and utility methods available in both projects. Therefore, this commit changes many files, but without a functional change.

spec/controllers/request_for_comments_controller_spec.rb

@@ -2,7 +2,7 @@
 
 require 'rails_helper'
 
-describe RequestForCommentsController do
+RSpec.describe RequestForCommentsController do
   render_views
 
   let(:user) { create(:admin) }
@@ -61,12 +61,10 @@ describe RequestForCommentsController do
   end
 
   describe 'GET #index' do
-    it 'renders the index template' do
-      get :index
+    before { get :index }
 
-      expect(response).to have_http_status :ok
-      expect(response).to render_template :index
-    end
+    expect_template(:index)
+    expect_http_status(:ok)
 
     it 'shows only rfc`s belonging to selected study group' do
       my_study_group = create(:study_group)