Add content to the Remote Census Configuration tab

- Render remote census configuration content on settings index.
 - Update type method from Setting
   On Admin::SettingsController#index we are using 'all_settings' to
   group all settings by 'type' method.
   'type' method return the first part of key when split by '.'
   To allow use by example: all_settings["remote_census.general"]
   and recover only settings related with this key we have added new
   'elsif' on 'type' method.

app/controllers/admin/settings_controller.rb

@@ -14,6 +14,9 @@ class Admin::SettingsController < Admin::BaseController
     @participation_processes_settings = all_settings["process"]
     @map_configuration_settings = all_settings["map"]
     @proposals_settings = all_settings["proposals"]
+    @remote_census_general_settings = all_settings["remote_census.general"]
+    @remote_census_request_settings = all_settings["remote_census.request"]
+    @remote_census_response_settings = all_settings["remote_census.response"]
     @uploads_settings = all_settings["uploads"]
   end