limit depth of toctrees

[dougbrn]

Improves the table of contents view for each of our documentation subsections by just displaying the sections, rather than a full list of all subsections.

[github-actions]

Before [3321b58]	After [b619025]	Ratio	Benchmark (Parameter)
33.5±0.09ms	33.4±0.2ms	1	benchmarks.time_prune_sync_workflow
32.9±0.2ms	32.5±0.1ms	0.99	benchmarks.time_batch

Click here to view all benchmarks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.78%. Comparing base (3321b58) to head (5bd65bd).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #422   +/-   ##
=======================================
  Coverage   95.78%   95.78%           
=======================================
  Files          25       25           
  Lines        1755     1755           
=======================================
  Hits         1681     1681           
  Misses         74       74           

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[nevencaplar]

So much better!