Fix docs

[nwlandry]

This PR:

• Removes "experimental" from the DiHypergraph class
• Makes the formatting requirements for PRs optional
• Updates the publishing process to reflect what we currently do.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.24%. Comparing base (e137361) to head (3bbbeab).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #614   +/-   ##
=======================================
  Coverage   93.24%   93.24%           
=======================================
  Files          62       62           
  Lines        4735     4735           
=======================================
  Hits         4415     4415           
  Misses        320      320           

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[maximelucas]

Thanks Nich! I think ultimately, we could aim at an even simpler process for PRs, even if just a guide for first contributors, next to the more complete pipeline. But for now this is good!