#314 - Switch to poetry

[reckart]

What's in the PR

• Remove setup.py
• Switch to pyproject.toml
• Update GitHub actions to use poetry
• Clean up code a bit according to feedback from flake8
• Update release guide

How to test manually

• Build
• Try release

Automatic testing

• [x] PR includes unit tests

Documentation

• [x] PR updates documentation

[codecov[bot]]

Codecov Report

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

Project coverage is 91.43%. Comparing base (a76b4e1) to head (29d539d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #315 +/- ## ========================================== - Coverage 95.47% 91.43% -4.04% ========================================== Files 5 5 Lines 2009 2009 Branches 0 520 +520 ========================================== - Hits 1918 1837 -81 Misses 91 91 - Partials 0 81 +81 ```

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