Both public and tailor-made: https://github.com/rust-lang/book/tree/main/tools
I'm investigating how to switch an organisation away from a docx-only mess of a documentation system, and it looks like you might have found a process that'd work for us, and let people keep using docx if they have to.
I wonder what all those binary blobs do to the git repo though.
Thanks for any info!
From my perspective, the markdown was the master copy.
Sorry I can't be of more help!