Remove ContentBlock related functionality

Because of a degree of complexity in how Govspeak is rendered in the
Publishing Platform, we can’t always fetch embedded content at the
point where Govspeak is rendered (this is particuarly the case in
Whitehall). With this in mind, and after some discussion with the team,
we’ve decided that, for now, it’s better to handle embeds in the
Publishing API.

With this in mind, rather than letting this functionality die on the
vine within Govspeak, we should remove the functionality altogether. As
this is pretty new code (and the content modelling team are the only
people aware of it and likely to use it), we should remove it from the
codebase entirely.

README.md

@@ -608,34 +608,6 @@ will output
 </div>
 ```
 
-### Content blocks
-
-Authors can embed different types of [supported content](https://github.com/alphagov/govspeak/blob/main/lib/govspeak/content_block.rb#L3) created by the Content Block Manager
-
-```
-{{embed:content_block_email_address:d308f561-e5ee-45b5-90b2-3ac36a23fad9}}
-```
-
-with options provided
-
-```
-{
-  content_blocks: [
-    {
-      content_id: "d308f561-e5ee-45b5-90b2-3ac36a23fad9",
-      title: "Government Digital Service",
-      details: { email_address: "[email protected]" },
-    }
-  ]
-}
-```
-
-will output
-
-```html
-<span class="embed_content_block_email_address" id="embed_d308f561-e5ee-45b5-90b2-3ac36a23fad9">[email protected]</span>
-```
-
 ### Button
 
 An accessible way to add button links into content, that can also allow cross domain tracking with [Google Analytics](https://support.google.com/analytics/answer/7372977?hl=en)

lib/govspeak.rb

@@ -14,14 +14,11 @@
 require "govspeak/html_validator"
 require "govspeak/html_sanitizer"
 require "govspeak/blockquote_extra_quote_remover"
-require "govspeak/content_block_extractor"
-require "govspeak/content_block"
 require "govspeak/post_processor"
 require "govspeak/link_extractor"
 require "govspeak/template_renderer"
 require "govspeak/presenters/attachment_presenter"
 require "govspeak/presenters/contact_presenter"
-require "govspeak/presenters/content_block_presenter"
 require "govspeak/presenters/h_card_presenter"
 require "govspeak/presenters/image_presenter"
 require "govspeak/presenters/attachment_image_presenter"
@@ -40,7 +37,7 @@ class Document
     @extensions = []
 
     attr_accessor :images
-    attr_reader :attachments, :contacts, :links, :locale, :content_blocks
+    attr_reader :attachments, :contacts, :links, :locale
 
     def self.to_html(source, options = {})
       new(source, options).to_html
@@ -60,7 +57,6 @@ def initialize(source, options = {})
       @attachments = Array.wrap(options.delete(:attachments))
       @links = Array.wrap(options.delete(:links))
       @contacts = Array.wrap(options.delete(:contacts))
-      @content_blocks = Array.wrap(options.delete(:content_blocks))
       @locale = options.fetch(:locale, "en")
       @options = { input: PARSER_CLASS_NAME,
                    sanitize: true,
@@ -259,15 +255,6 @@ def insert_strong_inside_p(body, parser = Govspeak::Document)
       render_image(AttachmentImagePresenter.new(attachment))
     end
 
-    extension("content blocks", Govspeak::ContentBlock::EMBED_REGEX) do |embed_code, _document_type, content_id|
-      next embed_code if content_blocks.empty?
-
-      embed = content_blocks.detect { |e| e[:content_id] == content_id }
-      next "" unless embed
-
-      ContentBlockPresenter.new(embed).render
-    end
-
     # As of version 1.12.0 of Kramdown the block elements (div & figcaption)
     # inside this html block will have it's < > converted into HTML Entities
     # when ever this code is used inside block level elements.