[WIP] Python variant#52

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gadenbuie:mainfrom

coatless-quarto:python-variant

Commits on Feb 5, 2024

Re-org, set `__init__.py` as export and version info; countdown.py as main countdown functions, and switch `pyproject.toml` to dynamic version
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More experiments to get feature rich HTML in ipynb working with htmltools.
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Commits on Mar 5, 2024