Here is the source on github in case you're still unable to access the page: https://github.com/ryan4yin/nixos-and-flakes-book https://github.com/ryan4yin/nixos

Here is the source on github in case you're still unable to access the page: https://github.com/ryan4yin/nixos-and-flakes-book https://github.com/ryan4yin/nixos-and-flakes-book