Add default site customization pages

From now on these static pages:

`/privacy'
`/conditions'
`/accesibility'
`/help/faq'
`/welcome'

have been moved to the DB and can be modified easily by any
administrator in `/admin/site_customization/pages'

app/controllers/welcome_controller.rb

@@ -12,6 +12,13 @@ class WelcomeController < ApplicationController
   end
 
   def welcome
+    if current_user.level_three_verified?
+      redirect_to page_path("welcome_level_three_verified")
+    elsif current_user.level_two_or_three_verified?
+      redirect_to page_path("welcome_level_two_verified")
+    else
+      redirect_to page_path("welcome_not_verified")
+    end
   end
 
   def verification