clean up tutorial notebooks

[atravitz]

PR Author Checklist

• added news item, or changes are not user-facing
• pre-commit CI passes (comment pre-commit.ci autofix to auto-format your PR).

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Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

Reviewer Checklist

• news entry has been added if necessary
• pre-commit auto fix has been run
• any API breaks have been documented

[review-notebook-app]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.24%. Comparing base (54cac89) to head (10563d7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #200   +/-   ##
=======================================
  Coverage   92.24%   92.24%           
=======================================
  Files          84       84           
  Lines        2618     2618           
=======================================
  Hits         2415     2415           
  Misses        203      203           

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