ruby/4.0.0/lib/ruby/gems/4.0.0/gems/markly-0.15.1/lib/markly/renderer/html.rb:13: warning: CGI library is removed from Ruby 4.0. Please use cgi/escape instead for CGI.escape and CGI.unescape features.
If you need to use the full features of CGI library, Please install cgi gem.