Code review comment for ~jugmac00/launchpadlib:add-configuration-file-for-rtd

Looks good to me, although I'm not into the details of readthedocs.yaml

Does the python section of the config basically tell it to build the docs from that path, to a `docs` directory, using pip?

I notice the other `.readthedocs.yaml` in our repos don't use `fail_on_warning`. I think it makes sense to add it, but maybe we also want to add it in the other ones to keep them consistent!