I reached the same hijacked domain. The original bitbooks.cc is archived on GitHub [1].

It looks like Bitbinder [2] was the static site builder which in turn used Franklin [3] to generate the online book.

[1]: https://github.com/bitbooks/bitbooks.cc

[2]: https://github.com/bitbooks/bitbinder

[3]: https://github.com/bryanbraun/franklin