Docs are not updated to date and miss some submodules

[paullo0106]

Describe the bug

In our docs page: https://causalml.readthedocs.io/en/latest/causalml.html# , it doesn't reflect the latest codebase, for example:

• Missing content in few modules: causalml.inference.tree and causalml.dataset

• Some latest code changes are not reflected, for example, we added n_jobs, a new parameter to NearestNeighborMatch last week
• New modules can be added: causalml.feature_selection, causalml.inference.nn, causalml.inference.tf, and etc.

Other note

Resolving this issue will improve the searchability and consistency of CausalML

[paullo0106]

some references to fix this bug might be @jeongyoonlee 's previous commit related to sphinx:
#335
https://github.com/uber/causalml/commits/master/docs/causalml.rst

[jeongyoonlee]

Thanks @paullo0106 for reporting this. I just published latest documentation to https://causalml.readthedocs.io. It's not currently publishing the docs automatically. I will look into it.

[jeongyoonlee]

I fixed the automatic docs publish by removing the existing the webhook between GitHub and ReadTheDocs, and adding it back.

Regarding missing submodules, tree should be a cython issue. I don't know why dataset module is not rendering. I will look into it further.

[jeongyoonlee]

Just fixed the missing API docs for inference.tree and dataset. ;)
Please check it out here: https://causalml.readthedocs.io/en/latest/causalml.html