Make API reference TOC visible

[jackgerrits]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.41%. Comparing base (b07c166) to head (3022970).
Report is 14 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4962   +/-   ##
=======================================
  Coverage   85.41%   85.41%           
=======================================
  Files          89       89           
  Lines        4298     4298           
=======================================
  Hits         3671     3671           
  Misses        627      627           

Flag	Coverage Δ
unittests	85.41% <ø> (ø)

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