Simplify nokogiri2/attribution

lib/docs/filters/nokogiri2/attribution.rb

@@ -1,12 +0,0 @@
-# frozen_string_literal: true
-
-module Docs
-  class Nokogiri2
-    class AttributionFilter < Docs::AttributionFilter
-      def attribution_link
-        url = current_url.to_s.sub! 'http://localhost', 'https://nokogiri.org/rdoc'
-        %(<a href="#{url}" class="_attribution-link">#{url}</a>)
-      end
-    end
-  end
-end

lib/docs/scrapers/nokogiri2.rb

@@ -8,9 +8,9 @@ module Docs
     self.name = 'Nokogiri'
     self.slug = 'nokogiri'
     self.release = '1.13.0'
+    self.base_url = "https://nokogiri.org/rdoc/"
 
     html_filters.replace 'rdoc/entries', 'nokogiri2/entries'
-    text_filters.replace 'attribution', 'nokogiri2/attribution'
 
     options[:root_title] = 'Nokogiri'
     options[:only_patterns] = [/\ANokogiri/, /\AXSD/]