Lint notebook examples

[dschick]

Add lining by nbqa via flake8 also to notebook examples

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.10%. Comparing base (e6ea077) to head (aa97a47).
⚠️ Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
udkm1Dsim/structures/layers.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #200   +/-   ##
========================================
  Coverage    86.10%   86.10%           
========================================
  Files           10       10           
  Lines         3217     3217           
========================================
  Hits          2770     2770           
  Misses         447      447           

Files with missing lines	Coverage Δ
udkm1Dsim/structures/structure.py	82.62% <100.00%> (ø)
udkm1Dsim/structures/layers.py	88.02% <0.00%> (ø)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 14 untouched benchmarks
⏩ 6 skipped benchmarks¹

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_{Comparing lint-notebook-examples (aa97a47) with develop (e6ea077)}

Footnotes

1. 6 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩