docs: improve getting started chapters #33198

Job	Run time
setup	1m 54s
Shard (0) Unit Tests	8m 42s
Shard (0) HTTP Integration Tests	11m 17s
integration-tests-packages	12m 37s
Shard (1) Unit Tests	5m 11s
Shard (0) Module Integration Tests	10m 47s
Shard (1) HTTP Integration Tests	9m 13s
Shard (1) Module Integration Tests	9m 38s
unit-tests	1s
integration-tests-modules	1s
integration-tests-http	1s
	1h 9m 22s

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