Remove deprecated about_us page and add redirect

app/controllers/home_controller.rb

@@ -7,7 +7,4 @@ class HomeController < BaseController
     @num_users = Spree::User.joins(:orders).merge(Spree::Order.complete).count('DISTINCT spree_users.*')
     @num_orders = Spree::Order.complete.count
   end
-
-  def about_us
-  end
 end

config/routes.rb

@@ -6,6 +6,7 @@ Openfoodnetwork::Application.routes.draw do
   get "/enterprises/:permalink", to: redirect("/")
   get "/products", to: redirect("/")
   get "/t/products/:id", to: redirect("/")
+  get "/about_us", to: redirect(ContentConfig.footer_about_url)
 
   get "/#/login", to: "home#index", as: :spree_login
   get "/login", to: redirect("/#/login")
@@ -115,8 +116,6 @@ Openfoodnetwork::Application.routes.draw do
     end
   end
 
-  get "about_us", :controller => 'home', :action => "about_us"
-
   namespace :open_food_network do
     resources :cart do
       post :add_variant