Add docs from openapi generator to docs + render all api docs + add u…

[sverhoeven]

…sage example

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.10%. Comparing base (a4ad77c) to head (95dbef0).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
+ Coverage   87.61%   89.10%   +1.48%     
==========================================
  Files          42       44       +2     
  Lines        1776     2147     +371     
==========================================
+ Hits         1556     1913     +357     
- Misses        220      234      +14     

Components	Coverage Δ
Python	∅ <ø> (∅)
Julia	87.51% <100.00%> (-0.10%)	⬇️
R	96.74% <ø> (∅)