Destroy now-unused routes

config/routes.rb

 Rails.application.routes.draw do
-  get 'static_pages/home'
-
-  get 'static_pages/sign_in'
-
-  get 'static_pages/sign_up'
-
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
 end