fix gh page workflow

[justinngan92]

• remove sphinx action

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.28%. Comparing base (cc0fb4a) to head (8ac2d27).
Report is 8 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
- Coverage   87.30%   87.28%   -0.03%     
==========================================
  Files          16       16              
  Lines        4522     4514       -8     
==========================================
- Hits         3948     3940       -8     
  Misses        574      574              

see 8 files with indirect coverage changes

[justinngan92]

Removed sphinx-action (uses: ammaraskar/sphinx-action@master) and instead use build command directly.

The workflow successfully run up to the push action - which failed because not owner of repo.

Next commit will revert the workflow to on: pull_request branches: [ gh-pages ]