Update docs action to copy llms.txt to github pages root on merge to main

[csvance]

No description provided.

[csvance]

Might have to do multiple commits to main in order to get this working, hopefully it works on the first!

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.96%. Comparing base (8f1a939) to head (3d948bb).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #104   +/-   ##
=======================================
  Coverage   90.96%   90.96%           
=======================================
  Files           7        7           
  Lines         531      531           
=======================================
  Hits          483      483           
  Misses         48       48           

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