Update documentation link

[williebsweet]

Switch from the current readthedocs documentation to the Datafold hosted documentation, which is also open-source.

[erezsh]

Page not found at root path: https://docs.datafold.com/os_diff/

Guides still mentions dbt: https://docs.datafold.com/guides/ci_guides_overview

imo The link to Join Us On Github should be just the repo https://github.com/datafold/data-diff, and not link the the README

[erezsh]

Also, is it possible to use git submodule, or some other mechanism, so that the docs can stay on the same repo as the code? Having to do a separate docs PR, in a different repo from the code PR, will make keeping them in sync much harder.

[leoebfolsom]

@williebsweet I've added the Python API Reference and New Database Driver instructions to the datafold docs: https://github.com/datafold/datafold-docs/pull/32

@erezsh as part of this PR I changed the readme-specific link to just a simple link to the data-diff repo

[erezsh]

@leoebfolsom There are some problems with this version of the Python API

• There is no side menu for quickly jumping around
• there are no links. for example, in "See Also", clicking object names doesn't send me to them.
• Most importantly, this is not auto-generated. How will I keep it in sync with the docstrings?

[williebsweet]

Resolved the above by just linking out to the readthedocs for the Python API.

@erezsh should we remove the rest of the documentation from readthedocs so that we don't have to keep both up to date?