support toml config

[ConorSheehan1]

Feature request

Would it be possible to support toml config, rather than just yaml?

https://docs.readthedocs.io/en/stable/config-file/v2.html
Instead of only parsing .readthedocs.yml, could you support a section in pyproject.toml, like [tool.readthedocs]?

Maybe similar to how isort handles config?
https://github.com/timothycrosley/isort#configuring-isort

[stsewd]

I'd say we should just support one format and one name actually too, currently we support 4 names for the config file. If we ever change to parse the config file before cloning the repo that would make it harder/slow.

[stsewd]

We won't be supporting more formats here, it would introduce more complexity and dependencies to our code base with little gain.