The Doxygen Documentation Should be Included/Rendered

[tweidinger]

For easier access and understanding the rendered documentation should be accessible without building it yourself.

I would suggest to do this automatically via Github workflow as required workflow step for each PR before allowing to merge into main and either render the documentation in a Github page or add the rendered docs folder to the repository.

I would propose something similar for the Rust bindings or link to the crates.io documentation, once released and published as a crate.

[stuxnot]

I've currently added a github action which updates the documentation automatically after a push to master, if the srcs have changed. This way, documentation updates only appear once (in the src code) in MRs. If you see any problems with this approach, I'm happy to change it :)

[pkoppe]

Docs are included now. They will also be published via GitHub Pages once the repo is public.