Docs in Lume

I decided to use Lume to power the KAFE docs instead of Docfx. I used it before for visitlab web, my own site, and some others. It has just a really pleasant developer experience, let's me do all sorts of stuff to the resulting HTML -- like syntax highlighting at build time -- and overall is a better tool to work with than Docfx. On the other hand, it doesn't generate an API reference for C# nor TS, which is something I'll work on later.

To run the docs locally with Docker use this:

docker build -f ./Docs.Dockerfile --build-arg PREFIX=/docs -t kafe-docs .
docker run --rm -it -p 8080:80 kafe-docs

(PREFIX is set to /docs by default, so you don't actually have to write it above. It is used since the docs are hosted at https://kafe.fi.muni.cz/docs).