Don't trigger CI for changes to markdown files only

[nathanjmcdougall]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #615 will not alter performance

_{Comparing 611-update-ci-to-ignore-doc-only-changes-in-md-files (f0169d4) with main (dd31162)}

Summary

✅ 1 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.54%. Comparing base (dd31162) to head (f0169d4).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #615   +/-   ##
=======================================
  Coverage   97.54%   97.54%           
=======================================
  Files         102      102           
  Lines        4444     4444           
=======================================
  Hits         4335     4335           
  Misses        109      109           

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