Render /voting-in-the-uk as multi-page guide

Undoes #1481

Reverting to the standard guide format now that the election period has
finished.

app/controllers/content_items_controller.rb

@@ -84,8 +84,6 @@ def format_banner_links(links, type)
   end
 
   def content_item_template
-    return "guide_single" if @content_item.render_guide_as_single_page?
-
     @content_item.schema_name
   end
 

app/presenters/content_item/parts.rb

@@ -61,9 +61,7 @@ def previous_and_next_navigation
 
     def part_link_elements
       parts.map do |part|
-        if render_guide_as_single_page?
-          { href: "##{part['slug']}", text: part["title"] }
-        elsif part["slug"] != current_part["slug"]
+        if part["slug"] != current_part["slug"]
           { href: part["full_path"], text: part["title"] }
         else
           { href: part["full_path"], text: part["title"], active: true }

app/presenters/content_item_presenter.rb

@@ -80,11 +80,6 @@ def cache_control_public?
     !content_item.cache_control.private?
   end
 
-  def render_guide_as_single_page?
-    # /voting-in-the-uk
-    content_id == "9315bc67-33e7-42e9-8dea-e022f56dabfa"
-  end
-
 private
 
   def display_date(timestamp, format = "%-d %B %Y")

config/routes.rb

@@ -11,9 +11,6 @@
 
   get "healthcheck", to: proc { [200, {}, [""]] }
 
-  # Testing guides as a single page so we redirect parts to the default page
-  get "/voting-in-the-uk/:chapter", to: redirect("/voting-in-the-uk#%{chapter}")
-
   get "*path/:variant" => "content_items#show",
       constraints: {
         variant: /print/,

test/integration/guide_test.rb

@@ -112,24 +112,6 @@ class GuideTest < ActionDispatch::IntegrationTest
     assert_nil faq_schema
   end
 
-  test "voting in the UK guide shows all chapters on a single page" do
-    content_item = setup_and_visit_voting_guide
-    part_titles = content_item["details"]["parts"].map { |part| part["title"] }
-
-    part_titles.each do |part_title|
-      assert page.has_css? "h1", text: part_title
-    end
-  end
-
-  def setup_and_visit_voting_guide
-    @content_item = get_content_example("guide").tap do |item|
-      item["base_path"] = "/voting-in-the-uk"
-      item["content_id"] = "9315bc67-33e7-42e9-8dea-e022f56dabfa"
-      content_store_has_item(item["base_path"], item.to_json)
-      visit_with_cachebust(item["base_path"])
-    end
-  end
-
   def setup_and_visit_part_in_guide
     @content_item = get_content_example("guide").tap do |item|
       chapter_path = "#{item['base_path']}/key-stage-1-and-2"