OPT: simplify the documentation workflow 📝

[eigenein]

• Install dependencies via Poetry
• Check docs in pull requests

[codecov[bot]]

Codecov Report

Merging #30 (03808d1) into main (402a106) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 03808d1 differs from pull request most recent head 94d4dad. Consider uploading reports for the commit 94d4dad to get more accurate results

@@           Coverage Diff           @@
##             main      #30   +/-   ##
=======================================
  Coverage   94.44%   94.44%           
=======================================
  Files          29       29           
  Lines         684      684           
  Branches       67       67           
=======================================
  Hits          646      646           
  Misses         32       32           
  Partials        6        6