You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: pages_controller.rb
    path of file: ./repos/classroom/app/controllers
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class PagesController < ApplicationController
  include I18nHelper

  layout "layouts/pages"

  skip_before_actio
    
  def help
    file_name = params[:article_name] ? params[:article_name] : "help"
    return not_found unless HELP_DOCUMENTS.include? file_name

    @file = File.read(Rails.root.join("docs", "#{file_name}.md"))

    @breadcrumbs = [["/", "GitHub Classroom"], ["/help", "Help"]]
    @breadcrumbs.push(["", file_name]) if file_name != "help"

    render layout: "layouts/pages"
  rescue Errno::ENOENT
    return not_found
  end