Revert "Add support for ads.txt redirect"

This reverts commit f6c7c2d1af.

Ads.txt redirection can be done directly in core, in admin/customize/permalinks.

config/locales/server.en.yml

@@ -51,7 +51,6 @@ en:
     adsense_post_bottom_ad_sizes: "Choose your ad size"
     adsense_mobile_post_bottom_ad_size: "Choose your ad size"
     adsense_nth_post_code: "Show an ad after every N posts, where N is this value."
-    adsense_ads_txt_url: "URL of ads.txt file."
 
     amazon_through_trust_level: "Show your ads to users based on trust levels. Users with trust level higher than this value will not see ads."
     amazon_topic_list_top_src_code: "Enter src code to display at topic list top location"

plugin.rb

@@ -176,20 +176,3 @@ and (max-width : 775px) {
 }
 
 CSS
-
-after_initialize do
-  require_dependency 'application_controller'
-  class ::AdstxtController < ::ApplicationController
-    skip_before_action :check_xhr
-
-    def index
-      raise Discourse::NotFound unless SiteSetting.adsense_ads_txt_url.present?
-
-      redirect_to SiteSetting.adsense_ads_txt_url
-    end
-  end
-
-  Discourse::Application.routes.append do
-    get '/ads.txt' => "adstxt#index"
-  end
-end