don't run CI for rtd changes

[atravitz]

I'm doing some debugging of the RTD build and the CI is running since .readthedocs.yml isn't in docs/

Checklist

• Added a news entry

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/.

[github-actions]

No API break detected ✅

[mikemhenry]

SAVE THE RAINFOREST!!!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.37%. Comparing base (9f0800f) to head (3b7fec6).
⚠️ Report is 100 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1490      +/-   ##
==========================================
- Coverage   95.23%   92.37%   -2.87%     
==========================================
  Files         165      165              
  Lines       12640    12640              
==========================================
- Hits        12038    11676     -362     
- Misses        602      964     +362     

Flag	Coverage Δ
fast-tests	92.37% <ø> (?)
slow-tests	?

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