Add developer docs and fix release process

[leplatrem]

• [x] dev docs
• [x] switch to PyPI’s trusted publishing implementation
• [x] configure trusted publishing in Pypi

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (213ab86) 98.23% compared to head (cae1096) 98.23%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #92 +/- ## ======================================= Coverage 98.23% 98.23% ======================================= Files 19 19 Lines 624 624 Branches 81 85 +4 ======================================= Hits 613 613 Misses 7 7 Partials 4 4 ```

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