[a3n]

Shameless plug: miki (Makefile Wiki) https://github.com/a3n/miki

"sitemap.html" and "catalog.json" are the most relevant parts. The project itself assumes you already follow some organizing principle based on the filesystem, and documents it for you, with links.

It's based on Makefile, and existing utilities, so you should be able to use it as is, customize it, or as a start of something better.