disable mypy and add CHANGELOG to docs

[cchwala]

• [x] temporarily circumvent (but not fix) problem documented in #3
• [x] All code checks from pre-commit passed
• [x] Added an entry in CHANGELOG file

[codecov[bot]]

Codecov Report

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

Comparison is base (687a5bb) 100.00% compared to head (81c5ee6) 100.00%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #18 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 2 2 Lines 20 20 ========================================= Hits 20 20 ```

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