move FirstTimeDataGenerator helper from applictaion controller

app/controllers/application_controller.rb

@@ -1,6 +1,4 @@
 class ApplicationController < ActionController::Base
-  include FirstTimeDataGenerator
-
   acts_as_token_authentication_handler_for User
   # Prevent CSRF attacks by raising an exception.
   # For APIs, you may want to use :null_session instead.

app/controllers/projects_controller.rb

@@ -295,6 +295,8 @@ class ProjectsController < ApplicationController
 
   private
 
+  include FirstTimeDataGenerator
+
   def generate_intro_demo
     return unless current_user.sign_in_count == 1
     team = current_user.teams.where(created_by: current_user).first