Documenter and workflow updates

[abhro]

• Fix linking in docs
• Use newer Documenter
• Use julia-docdeploy action

[Roger-luo]

thank you! I'll wait for CI to pass.

[Roger-luo]

uhh... CI fails somehow

[abhro]

GitHub turned off support for old action versions. I'll push a commit updating them. 👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.65%. Comparing base (7f1f5d5) to head (a0cbb94).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #289      +/-   ##
==========================================
- Coverage   81.41%   80.65%   -0.76%     
==========================================
  Files          24       21       -3     
  Lines        1630     1566      -64     
==========================================
- Hits         1327     1263      -64     
  Misses        303      303              

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