bringing back the styleguide

completes #67

app/controllers/admin_controller.rb

@@ -1,6 +1,6 @@
 class AdminController < ApplicationController
   layout 'admin'
-  before_action :authorize_admin
+  before_action :authorize_admin, except: :styleguide
 
   def dashboard
     @quizzes = Quiz.includes(:questions).all

app/controllers/application_controller.rb

@@ -16,6 +16,10 @@ class ApplicationController < ActionController::Base
   end
   helper_method :current_candidate
 
+  def styleguide
+    render '/styleguide'
+  end
+
   private
 
     def auth_params