docs(install): new install sections & updated getting started #6423

Job	Run time
Build docker image	6m 15s
config-e2e	1s
Agent unit tests	2m 2s
CLI unit tests	1m 44s
API Server unit tests	3m 43s
WebUI unit tests	1m 58s
CLI smoke tests (local)	40s
Test examples (collector)	41s
CLI smoke tests (docker)	40s
CLI e2e tests (8, 0)	2m 42s
WebUI End-to-end tests (1)	3m 15s
Test examples (tracetest-jaeger)	38s
CLI e2e tests (8, 1)	2m 35s
WebUI End-to-end tests (2)	3m 18s
Test examples (tracetest-opensearch)	7m 23s
CLI e2e tests (8, 2)	2m 34s
WebUI End-to-end tests (3)	56s
Test examples (tracetest-tempo)	40s
Tracetesting API Server (InMemory)	3m 54s
CLI e2e tests (8, 3)	2m 31s
WebUI End-to-end tests (4)	53s
Test examples (tracetest-provisioning-env)	42s
CLI e2e tests (8, 4)	2m 32s
WebUI End-to-end tests (5)	3m 37s
CLI e2e tests (8, 5)	3m 55s
WebUI End-to-end tests (6)	3m 13s
CLI e2e tests (8, 6)	2m 32s
Tracetesting API Server (NATS)	4m 0s
WebUI End-to-end tests (7)	53s
CLI e2e tests (8, 7)	4m 46s
WebUI End-to-end tests (8)	3m 14s
	1h 18m 27s

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