misc framework updates

[casperdcl]

• fix docs build
• migrate setup.{cfg,py} => pyproject.toml
• minify package data
• tidy build/test requirements
• update pre-commit tests

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -1.45 :warning:

Comparison is base (ed933a6) 91.06% compared to head (b059a04) 89.62%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #139 +/- ## ========================================== - Coverage 91.06% 89.62% -1.45% ========================================== Files 3 3 Lines 347 347 ========================================== - Hits 316 311 -5 - Misses 31 36 +5 ``` | [Impacted Files](https://app.codecov.io/gh/iterative/shtab/pull/139?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iterative) | Coverage Δ | | |---|---|---| | [shtab/\_\_init\_\_.py](https://app.codecov.io/gh/iterative/shtab/pull/139?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iterative#diff-c2h0YWIvX19pbml0X18ucHk=) | `91.69% <ø> (-1.67%)` | :arrow_down: |

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