Rewrite Jupyter Notebook examples as Python examples

[speth]

Changes proposed in this pull request

• Rewrite (most) examples from https://github.com/Cantera/cantera-jupyter as pure Python examples to be parsed by Sphinx Gallery. There are a few exceptions:
  • Skip 1D_pfr_surfchem.ipynb, It is almost wholly superseded by the FlowReactor-based version (1D_pfr_surfchem.py). The only exception is the "adiabatic" case, but this is problematic because the original reaction kinetics are only valid at a single temperature.
  • The useful comments and features from batch_reactor_ignition_delay_NTC.ipynb and nonideal_shock_tube.ipynb are incorporated into the existing NonIdealShockTube.py example.
  • lithium_ion_battery.ipynb was used to update the existing lithium_ion_battery.py, mainly by including the extended model description.
  • flame_speed_with_sensitivity_analysis.ipynb was used to update the existing flamespeed_sensitivity.py
  • twin_premixed_flame_axisymmetric.ipynb was used to update the existing premixed_counterflow_twin_flame.py.
  • I'm not quite sure what to do with ck2yaml_demo.ipynb. Bringing this back into the main repository would bring back in a bunch of CK input data that we deliberately removed, and I'm not sure how useful it is in general compared to the ck2yaml tutorial already in the Users' Guide.. Per @ischoegl's comment below, this example is not being migrated.
• Fix a documentation typo in the PFR model description as noted in the Users' Group

For all the examples that included diagrams, I re-drew the PNGs in Adobe Illustrator and saved them as SVGs, to avoid having to commit these moderately large binary files into the repo, and because the vector versions just look nicer.

I've added co-author credit in the commit message for the original authors of the Jupyter examples.

Note that this already incorporates the fix to the 1D packed bed example from Cantera/cantera-jupyter#47.

If applicable, fill in the issue number this pull request is fixing

• I believe this is the last major step in addressing https://github.com/Cantera/enhancements/issues/178.

If applicable, provide an example illustrating new features this pull request is introducing

Checklist

• [x] The pull request includes a clear description of this code change
• [x] Commit messages have short titles and reference relevant issues
• [x] Build passes (scons build & scons test) and unit tests address code coverage
• [x] Style & formatting of contributed code follows contributing guidelines
• [x] The pull request is ready for review

[codecov[bot]]

Codecov Report

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

Project coverage is 75.69%. Comparing base (0c89553) to head (923af6f). Report is 17 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1681 +/- ## ========================================== + Coverage 72.76% 75.69% +2.93% ========================================== Files 378 443 +65 Lines 56986 60975 +3989 Branches 20691 9551 -11140 ========================================== + Hits 41468 46158 +4690 + Misses 12463 11786 -677 + Partials 3055 3031 -24 ```

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