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feat(gate): bring the root docs/*.md pages into the doc-snippet walk #15450

Job	Run time
Build Docs	15s
Test (shard 1/4)	15m 43s
Test (shard 4/4)	13m 24s
Changeset Fixed Group Check	8s
Build & E2E	1m 1s
Type Check	7m 14s
Test (shard 3/4)	13m 20s
Test (shard 2/4)	14m 15s
Test (coverage shard ${{ matrix.shard }}/4)	-1s
Test (coverage)	-1s
	1h 5m 18s