Update exoplanet notebooks

[mwcraig]

I may YOLO this since we may use it in class today 😬

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 11.53846% with 23 lines in your changes missing coverage. Please review.

Project coverage is 79.88%. Comparing base (b9bf579) to head (972b356). Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
...llarphot/differential_photometry/aij_rel_fluxes.py	11.53%	23 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #480 +/- ## ========================================== - Coverage 80.32% 79.88% -0.45% ========================================== Files 32 32 Lines 4067 4092 +25 ========================================== + Hits 3267 3269 +2 - Misses 800 823 +23 ```

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[mwcraig]

Gonna yolo...