chore: remove deprecated/removed features from docs #8883

Job	Run time
CodeQL	7m 1s
CodeQL	7m 1s
test	18m 1s
test	18m 1s
build	4m 53s
build	4m 53s
lint	17m 59s
lint	17m 59s
integration-configs-db	2m 8s
integration-configs-db	2m 8s
integration (requires_docker)	6m 15s
integration (requires_docker)	6m 15s
integration (integration_alertmanager)	3m 47s
integration (integration_alertmanager)	3m 47s
integration (integration_backward_compatibility)	9m 20s
integration (integration_backward_compatibility)	8m 29s
integration (integration_memberlist)	7m 37s
integration (integration_memberlist)	7m 37s
integration (integration_querier)	12m 18s
integration (integration_querier)	12m 18s
integration (integration_ruler)	4m 4s
integration (integration_ruler)	4m 4s
integration (integration_query_fuzz)	2m 25s
integration (integration_query_fuzz)	2m 25s
deploy_website	0s
deploy_website	0s
deploy	0s
deploy	0s
	3h 10m 45s

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