docs for Python

[nedtwigg]

• if the branch name starts with selfie.dev/blahblah then Cloudflare Pages will comment on the PR with nice preview links, just FYI
• /py is still a redirect to an issue
• but /py/get-started is real, and so is /py/cache and /py/facets

Start by doing /py/get-started, then do /py/cache and /py/facets. When those are done, we can work on the homepage /py, but it's a bit trickier to keep hidden until we actually have something that people can use.

I'll work on getting these artifacts published so that you have real PyPI URLs to link to, but you can still convert code examples and write documentation.

[nedtwigg]

• I setup publishing to PyPI (pip install selfie-lib now works).
• I also setup https://github.com/diffplug/selfie/pull/317

Make sure to link to these places:

• https://pypi.org/project/selfie-lib/
• https://pypi.org/project/pytest-selfie/
• https://pydoc.selfie.dev/

Optionally, you can use this to make it easy to link to the latest version

• ![](https://img.shields.io/pypi/v/selfie-lib) should render as
• you might be able to customize stuff here https://shields.io/badges/py-pi-version