Add style guide links to rubocop config

add_style_guide_links.rb

require "net/http"
require "yaml"

rubocop_config = YAML.load_file(".rubocop.yml")

rubocop_config.keys.each do |key|
  if key.include? "/"
    cop, rule = key.split("/")
    docs = "rubocop"
    if ["Performance", "Rails"].include? cop
      docs += "-#{cop.downcase}"
    end
    docs_link = "https://docs.rubocop.org/#{docs}/cops_#{cop}.html##{cop}#{rule}".downcase
    uri = URI(docs_link)
    response = Net::HTTP.get_response(uri)
    unless response.code.to_i >= 400
      rubocop_config[key]["StyleGuide"] = docs_link
    end
  end
end

File.open(".rubocop.yml", "w") { |file| file.write(rubocop_config.to_yaml) }