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docs: delete eight obsolete planning docs and point the root docs at the live pages #50874

Job	Run time
filter	28s
Build UI Deps	4m 50s
Build Docs	4m 50s
Test Core (5/8)	29m 13s
Build Core	9m 40s
Test Core (1/8)	14m 59s
Test Core (7/8)	16m 46s
Test Core (8/8)	10m 19s
Test Core (4/8)	19m 11s
Test Core (2/8)	11m 14s
Test Core (6/8)	18m 56s
Test Core (3/8)	20m 20s
Dogfood Regression Gate	35s
Temporal Conformance (live PG + MySQL)	0s
Dogfood Regression Gate (${{ matrix.shard }}/3)	0s
Dogfood Verify CLI	0s
Type Check UI	14m 58s
Build & E2E UI	2m 13s
Test UI (${{ matrix.shard }}/16)	0s
Lint UI	-1s
Test Core	37s
	2h 59m 8s