Refactor tutorials: remove outputs from tutorials.

[janfb]

• small fixes to getting_started tutorial

• I wrote a custom nb preprocessor that strips everything except plots and prints from all notebooks.

• I will add this script to CI for building the docs in a separate PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.28%. Comparing base (8afd985) to head (b928a91).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1266      +/-   ##
==========================================
- Coverage   86.05%   78.28%   -7.78%     
==========================================
  Files         118      119       +1     
  Lines        8672     8698      +26     
==========================================
- Hits         7463     6809     -654     
- Misses       1209     1889     +680     

Flag	Coverage Δ
unittests	78.28% <ø> (-7.78%)	⬇️

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see 28 files with indirect coverage changes

[michaeldeistler]

Thanks a ton, this is much better!! I only had a look at 00_getting_started and left a few comments.

[michaeldeistler]

Good to go now!