meta: add community health files for org README

On the landing page of the organization we have an opportunity to bring attention to things like CoC, events, and other quick links - as well as a place to display sponsors.

Some examples from across the GitHub land:

github.com/microsoft

github.com/django

github.com/litestar-org

github.com/getsentry

There are two distinct customization here: internal and public.

This means we could have an internal (anyone in the python organization) README with some nice-to-knows or events to keep track of (buildbot outage windows, reminders to enable 2FA, etc.) and a public one with the aforementioned links.

Some documentation about it:

• https://docs.github.com/en/organizations/collaborating-with-groups-in-organizations/customizing-your-organizations-profile
• https://github.blog/changelog/2021-09-14-readmes-for-organization-profiles/