No writeup, but have published a 'serverless' Kindle dictionary using a similar method. This is for reading the Game of Thrones books to improve the x-ray feature. Instead of Gitbook it's just a Jekyll site with some Liquid templates to generate the files needed for Amazon's kindlegen program. Builds happen in Travis and it's hosted on Pages.

- https://github.com/wjdp/gotdict - https://gotdict.wjdp.uk/