docs: avoid having a drop down in the top navigation bar

[jorgepiloto]

Description

This is completely optional, so feel free to discard and close.

This pull-request gets rid of the drop-down in the top navigation bar, accommodating all the headers before the drop-down comes in.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.85%. Comparing base (07ec973) to head (ec7655f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1485   +/-   ##
=======================================
  Coverage   91.85%   91.85%           
=======================================
  Files          86       86           
  Lines        6927     6927           
=======================================
  Hits         6363     6363           
  Misses        564      564           

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[RobPasMue]

Aha! Thanks @jorgepiloto - looks really nice! Merging