add: openapi spec to readthedocs

[righel]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.32%. Comparing base (3c33e1d) to head (82a6b84).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #238   +/-   ##
=======================================
  Coverage   74.32%   74.32%           
=======================================
  Files         145      145           
  Lines       10246    10246           
=======================================
  Hits         7615     7615           
  Misses       2631     2631           

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