Remove docs redirects raketask

This is now run in the gitlab-docs repo
https://gitlab.com/gitlab-org/gitlab-docs/-/merge_requests/1845

Changelog: other

lib/tasks/gitlab/docs/redirect.rake

@@ -57,68 +57,5 @@ namespace :gitlab do
         post.puts "<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->"
       end
     end
-
-    desc 'GitLab | Docs | Clean up old redirects'
-    task :clean_redirects do
-      #
-      # Calculate new path from the redirect URL.
-      #
-      # If the redirect is not a full URL:
-      #   1. Create a new Pathname of the file
-      #   2. Use dirname to get all but the last component of the path
-      #   3. Join with the redirect_to entry
-      #   4. Substitute:
-      #      - '.md' => '.html'
-      #      - 'doc/' => '/ee/'
-      #
-      # If the redirect URL is a full URL pointing to the Docs site
-      # (cross-linking among the 4 products), remove the FQDN prefix:
-      #
-      #   From : https://docs.gitlab.com/ee/install/requirements.html
-      #   To   : /ee/install/requirements.html
-      #
-      def new_path(redirect, filename)
-        if !redirect.start_with?('http')
-          Pathname.new(filename).dirname.join(redirect).to_s.gsub(%r(\.md), '.html').gsub(%r(doc/), '/ee/')
-        elsif redirect.start_with?('https://docs.gitlab.com')
-          redirect.gsub('https://docs.gitlab.com', '')
-        else
-          redirect
-        end
-      end
-
-      today = Time.now.utc.to_date
-
-      #
-      # Find the files to be deleted.
-      # Exclude 'doc/development/documentation/index.md' because it
-      # contains an example of the YAML front matter.
-      #
-      files_to_be_deleted = `grep -Ir 'remove_date:' doc | grep -v doc/development/documentation/index.md | cut -d ":" -f 1`.split("\n")
-
-      #
-      # Iterate over the files to be deleted and print the needed
-      # YAML entries for the Docs site redirects.
-      #
-      files_to_be_deleted.each do |filename|
-        frontmatter = YAML.safe_load(File.read(filename))
-        remove_date = Date.parse(frontmatter['remove_date'])
-        old_path = filename.gsub(%r(\.md), '.html').gsub(%r(doc/), '/ee/')
-
-        #
-        # Check if the removal date is before today, and delete the file and
-        # print the content to be pasted in
-        # https://gitlab.com/gitlab-org/gitlab-docs/-/blob/master/content/_data/redirects.yaml.
-        # The remove_date of redirects.yaml should be nine months in the future.
-        # To not be confused with the remove_date of the Markdown page.
-        #
-        next unless remove_date < today
-
-        File.delete(filename) if File.exist?(filename)
-        puts "  - from: #{old_path}"
-        puts "    to: #{new_path(frontmatter['redirect_to'], filename)}"
-        puts "    remove_date: #{remove_date >> 9}"
-      end
-    end
   end
 end