Is Github repo for Ruby Science Book still available?

I’m trying to access GitHub - thoughtbot/ruby-science: The reference for writing fantastic Rails applications but I’m getting a 404 page, I saw this is an old book, but does anyone know if this repo still exists, or changed to another place?

Ruby Science was previously included as part of a Upcase, but has since been split off as its own item. It can now be found here: Ruby Science