Cards

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- Major change to get ready for some upcoming training.
- Docs are out of date now, so disabling many of them until they can be updated.
- README.md should have enough to get started, if you want to try it out.

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- version bump to test CD

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- setuptools -> flit
- click -> typer
- pre-commit
- black
- flake8

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- README.rst -> README.md

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- add priority

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- rewrote API, tests