Remove content pages AB test

The test is now complete, so we can remove it.

app/assets/stylesheets/application.scss

@@ -17,7 +17,6 @@
 @import 'helpers/add-title-margin';
 @import "helpers/content-bottom-margin";
 @import "helpers/publisher-metadata-with-logo";
-@import "helpers/taxonomy-navigation";
 
 // Components from this application
 @import 'components/*';

app/controllers/content_items_controller.rb

@@ -1,5 +1,4 @@
 class ContentItemsController < ApplicationController
-  include ContentPagesNavAbTestable
 
   rescue_from GdsApi::HTTPForbidden, with: :error_403
   rescue_from GdsApi::HTTPNotFound, with: :error_notfound
@@ -15,8 +14,6 @@ class ContentItemsController < ApplicationController
   def show
     load_content_item
 
-    load_taxonomy_navigation if show_new_navigation?
-
     set_expiry
     set_access_control_allow_origin_header if request.format.atom?
     set_guide_draft_access_token if @content_item.is_a?(GuidePresenter)
@@ -61,54 +58,6 @@ def set_guide_draft_access_token
   def load_content_item
     content_item = Services.content_store.content_item(content_item_path)
     @content_item = PresenterBuilder.new(content_item, content_item_path).presenter
-    @content_item.include_collections_in_other_publisher_metadata = show_new_navigation?
-  end
-
-  def load_taxonomy_navigation
-    if @content_item.taxons.present?
-      current_base_path = @content_item.base_path
-      taxons = @content_item.taxons.select { |taxon| taxon["phase"] == "live" }
-      taxon_ids = taxons.map { |taxon| taxon["content_id"] }
-
-      @taxonomy_navigation = {}
-      @content_item.links_out_supergroups.each do |supergroup|
-        supergroup_taxon_links = "Supergroups::#{supergroup.camelcase}".constantize.new(current_base_path, taxon_ids, filter_content_purpose_subgroup: @content_item.links_out_subgroups(supergroup))
-        @taxonomy_navigation[supergroup.to_sym] = supergroup_taxon_links.tagged_content
-      end
-
-      @tagged_taxons = taxons.map do |taxon|
-        {
-          taxon_id: taxon["content_id"],
-          taxon_name: taxon["title"],
-          taxon_link: taxon["base_path"],
-        }
-      end
-
-      @related_collections = @content_item
-                               .content_item
-                               .dig('links', 'document_collections')
-                               .yield_self { |document_collections| document_collections || [] }
-                               .select { |document_collection| document_collection['document_type'] == 'document_collection' }
-                               .map { |document_collection| document_collection.values_at('base_path', 'title') }
-
-      # Fetch link attributes of parent step by steps required to render the top navigation banner
-      step_by_step_links = @content_item
-                        .content_item
-                        .dig('links', 'part_of_step_navs')
-                        .yield_self { |part_of_step_navs| part_of_step_navs || [] }
-                        .sort_by { |step_by_step_nav| step_by_step_nav['title'] }
-                        .map { |step_by_step_nav| step_by_step_nav.values_at('title', 'base_path') }
-      @banner_items = format_banner_links(step_by_step_links, "Step by Step")
-
-      # Append link attributes of parent taxons to our collections of items for the top navigation banner if the
-      # content item is tagged to more than one taxon. If there is only one taxon a breadcrumb will be used instead.
-      if taxons.many?
-        taxon_links = taxons
-                           .sort_by { |taxon| taxon[:taxon_name] }
-                           .map { |taxon| taxon.values_at('title', 'base_path') }
-        @banner_items += format_banner_links(taxon_links, "Taxon")
-      end
-    end
   end
 
   def format_banner_links(links, type)

app/helpers/phase_label_helper.rb

@@ -1,17 +1,6 @@
 module PhaseLabelHelper
   def render_phase_label(presented_object, message)
-    if show_new_navigation?
-      beta_message = <<~BETA_MESSAGE.html_safe
-        This is a test version of the layout of this page.
-        <a id=taxonomy-navigation-survey
-          href='https://www.smartsurvey.co.uk/s/navigationsurvey2018?c=#{current_path_without_query_string}'
-          target='_blank'
-          rel='noopener noreferrer'>Take the survey to help us improve it</a>
-      BETA_MESSAGE
-
-      render 'govuk_publishing_components/components/phase_banner', phase: 'beta', message: beta_message
-
-    elsif presented_object.respond_to?(:phase) && %w(alpha beta).include?(presented_object.phase)
+    if presented_object.respond_to?(:phase) && %w(alpha beta).include?(presented_object.phase)
       locals = {}
       locals[:message] = message if message.present?
 

app/lib/services.rb

@@ -11,9 +11,4 @@ def self.content_store
       disable_cache: true,
     )
   end
-
-  def self.rummager
-    @rummager ||= GdsApi::Rummager.new(Plek.new.find("rummager"),
-      timeout: 2)
-  end
 end

app/presenters/content_item/metadata.rb

@@ -20,18 +20,14 @@ def important_metadata
     end
 
     def publisher_metadata
-      {}.tap do |publisher_metadata|
-        publisher_metadata[:published] = published
-        publisher_metadata[:last_updated] = updated
-        publisher_metadata[:link_to_history] = !!updated
-        publisher_metadata[:other] = {
-          from: from,
+      {
+        published: published,
+        last_updated: updated,
+        link_to_history: !!updated,
+        other: {
+          from: from
         }
-
-        if include_collections_in_other_publisher_metadata
-          publisher_metadata[:other][:collections] = links('document_collections')
-        end
-      end
+      }
     end
   end
 end

app/presenters/content_item_presenter.rb

@@ -1,6 +1,5 @@
 class ContentItemPresenter
   include ContentItem::Withdrawable
-  include ContentItem::LinksOut
 
   attr_reader :content_item,
               :requested_content_item_path,