Consider SemVerDoc for the book

[wamserma]

With Nix and its ecosystem evolving, I expect regular updates of the book.
Consider using https://semverdoc.org/ from the beginning to avoid confusion in the future.

[jonringer]

I think this makes sense, and I'm a fan of semver. I think once we 1.0.0 the book, then we can use this versioning scheme.

cc @nrdxp

[nrdxp]

definitely makes sense to me