Make subpages collapse in manual sidebar. No new release (docs only)

[ablaom]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.89%. Comparing base (33d8852) to head (1cdb23a).
Report is 31 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1131   +/-   ##
=======================================
  Coverage   57.89%   57.89%           
=======================================
  Files           2        2           
  Lines          38       38           
=======================================
  Hits           22       22           
  Misses         16       16           

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