Feature: Allow unlimited multi-level navigation #1942

Job	Run time
Build (github-pages gem)	32s
Validate HTML (3.2)	26s
Test CSS and JS (18.x)	9s
Build (jekyll gem) (3.9, ubuntu-latest, 3.1)	26s
Build (jekyll gem) (3.9, ubuntu-latest, 3.2)	26s
Build (jekyll gem) (3.9, ubuntu-latest, 3.3)	30s
Build (jekyll gem) (3.9, macos-latest, 3.1)	1m 2s
Build (jekyll gem) (3.9, macos-latest, 3.2)	59s
Build (jekyll gem) (3.9, macos-latest, 3.3)	1m 2s
Build (jekyll gem) (3.9, windows-latest, 3.1)	2m 18s
Build (jekyll gem) (3.9, windows-latest, 3.2)	2m 35s
Build (jekyll gem) (3.9, windows-latest, 3.3)	3m 33s
Build (jekyll gem) (4.3, ubuntu-latest, 3.1)	24s
Build (jekyll gem) (4.3, ubuntu-latest, 3.2)	25s
Build (jekyll gem) (4.3, ubuntu-latest, 3.3)	25s
Build (jekyll gem) (4.3, macos-latest, 3.1)	58s
Build (jekyll gem) (4.3, macos-latest, 3.2)	43s
Build (jekyll gem) (4.3, macos-latest, 3.3)	37s
Build (jekyll gem) (4.3, windows-latest, 3.1)	2m 7s
Build (jekyll gem) (4.3, windows-latest, 3.2)	3m 30s
Build (jekyll gem) (4.3, windows-latest, 3.3)	3m 23s
	26m 30s

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