config stable and dev docs

[d-chambers]

Description

This PR implements two documentation build/deployments and updates the corresponding links in the readme and top page of the docs.

The two builds are:

stable: deployed at dascore.org and built whenever a new release is made from github (which triggers PyPI/conda releases).

development: deployed at dascore.quarto.pub/dascore and built whenever commits are merged into master.

The problem this solves:

New users install dascore with pip/conda. Then they look at dascore.org, but the code there might not work since currently it is for the master branch (which might be quite different from the previous release). Essentially, this PR should make for a better (less confusing) onboarding experience for new users while still giving us a chance to see up-to-date development (from master branch) docs.

The hosting site for the development docs is (quarto-pub)[https://quartopub.com/], a free site for hosting quarto projects up to 100mb. Dascore's docs are currently ~40mb.

closes #160

Checklist

I have (if applicable):

• referenced the GitHub issue this PR closes.
• documented the new feature with docstrings or appropriate doc page.
• included a test. See testing guidelines.
• your name has been added to the contributors page (docs/contributors.md).
• added the "ready_for_review" tag once the PR is ready to be reviewed.

[d-chambers]

Unfortunately, there isn't a very good way to test this other than merging it to trigger the appropriate actions, so here it goes...