Normalize page paths

Normalize page paths so they can be accessed by `page_path(:id)`.

The benefit of this is that we can add any arbitrary amount of pages
without affecting the routing layer.

config/routes.rb

@@ -259,21 +259,7 @@ Rails.application.routes.draw do
   end
 
   # static pages
-  get "/census_terms", to: "pages#census_terms"
-  get "/conditions", to: "pages#conditions"
-  get "/general_terms", to: "pages#general_terms"
-  get "/privacy", to: "pages#privacy"
-  get "/coming_soon", to: "pages#coming_soon"
-  get "/how_it_works", to: "pages#how_it_works"
-  get "/how_to_use", to: "pages#how_to_use"
-  get "/more_information", to: "pages#more_information"
-  get "/opendata", to: "pages#opendata"
-  get "/participation", to: "pages#participation"
-  get "/proposals_info", to: "pages#proposals_info"
-  get "/participation_facts", to: "pages#participation_facts"
-  get "/participation_world", to: "pages#participation_world"
-  get "/faq", to: "pages#faq"
-  get "/blog", to: "pages#blog"
-  get "/accessibility", to: "pages#accessibility"
-  get "/verifica", to: "verification/letter#edit"
+
+  get '/blog' => redirect("http://diario.madrid.es/participa/")
+  resources :pages, path: '/', only: [:show]
 end