[PATCH v6 22/23] dts: add doc generation dependencies

[Juraj Linkeš]

> I do get some warning while I build the doc:
>
> $ poetry install --with docs
>
> [...]
>
> Installing dependencies from lock file
> Warning: poetry.lock is not consistent with pyproject.toml. You may be
> getting improper dependencies. Run `poetry lock [--no-update]` to fix it.

Looks like my version had an improper content-hash. I'll fix it in the
next version.

>
> The doc seems to build fine though