combined docs

[orangecms]

So far, we are looking into Rust docs deployment - see #85.
There are additional docs with graphs and other images that Rustdoc is not really made for, which could be built with e.g. mdBook.

We could somehow put mdBook and Rust Docs side-by-side, à la:

• apis/ for Rustdoc
• docs/ for mdBook

How do we link one to the other?
A hardcoded (relative) Markdown link would be good enough, probably.

There is a hint here:
https://github.com/peaceiris/actions-gh-pages?tab=readme-ov-file#%EF%B8%8F-mdbook-rust

put ./target/doc/ to your ./book/src dir before you mdbook build

Related:

• Integrate mdbook into rustdoc rust-lang/rust#66249
• https://internals.rust-lang.org/t/rustdoc-include-an-external-markdown-file-as-a-separate-page/15994