fix(ci): update workflow triggers for automated docs publishing

[ogorman89]

• [ x ] I certify that this PR does not contain any code that has been generated with GitHub Copilot or any other AI-based code generation tool, in accordance with this project's policies.

Description

Updates the publish_docs workflow trigger to trigger on updates to docs/ or CHANGELOG.md but not README.md

Testing done

• very minor
• will test on next SK release!

Additional info

Resolves acrl-190

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.40%. Comparing base (3f2846b) to head (612728a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #204   +/-   ##
=======================================
  Coverage   72.40%   72.40%           
=======================================
  Files          58       58           
  Lines        3294     3294           
  Branches      166      166           
=======================================
  Hits         2385     2385           
  Misses        753      753           
  Partials      156      156           

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