Add guide on Poetry

[astrojuanlu]

Clarifies how Poetry is supported on Read the Docs.

[agjohnson]

Looks great! There maybe there isn't really anything substantial here, but maybe we want to mention how to verify that the dependencies are being used? This guide goes to mention pinning and the lock file, but might leave the reader guessing how to wrap this process up.

[astrojuanlu]

🤖 Rendered version: https://docs--8702.org.readthedocs.build/en/8702/guides/poetry.html

[astrojuanlu]

There maybe there isn't really anything substantial here,

Yep, it ended up being quite short. At least now "poetry" returns something in the search.

but maybe we want to mention how to verify that the dependencies are being used? This guide goes to mention pinning and the lock file, but might leave the reader guessing how to wrap this process up.

Opened #8704 to track this discussion in a more general way, so it's useful for other pages as well.