Tidy up the repo

[honzajavorek]

• #26
• master...honzajavorek/facelift
• README master...honzajavorek/facelift#diff-7b3ed02bc73dc06b7db906cf97aa91dec2b2eb21f2d92bc5caa761df5bbc168f
• pyproject.toml master...honzajavorek/facelift#diff-50c86b7ed8ac2cf95bd48334961bf0530cdc77b5a56f852c5c61b89d735fd711
• use ruff

Releasing and CI inspiration:

• https://github.com/juniorguru/teemup/tree/main/.github/workflows
• https://pypi.org/manage/projects/

Drop also 3.8, because:

• https://devguide.python.org/versions/#python-release-cycle