docs(Getting Started): Improve overview and explain options #6636

Job	Run time
API Server unit tests	2m 40s
CLI unit tests	33s
Build docker image	5m 45s
config-e2e	1s
Agent unit tests	1m 5s
WebUI unit tests	1m 52s
Tracetesting API Server (InMemory)	3m 50s
CLI smoke tests (local)	41s
CLI e2e tests (8, 0)	1m 29s
CLI e2e tests (8, 1)	1m 25s
CLI smoke tests (docker)	42s
WebUI End-to-end tests (1)	2m 30s
Test examples (collector)	40s
CLI e2e tests (8, 2)	1m 23s
Test examples (tracetest-jaeger)	39s
CLI e2e tests (8, 3)	1m 22s
WebUI End-to-end tests (2)	2m 29s
Test examples (tracetest-opensearch)	7m 29s
CLI e2e tests (8, 4)	1m 29s
Tracetesting API Server (NATS)	3m 52s
Test examples (tracetest-tempo)	40s
WebUI End-to-end tests (3)	2m 27s
CLI e2e tests (8, 5)	2m 39s
Test examples (tracetest-provisioning-env)	40s
WebUI End-to-end tests (4)	2m 29s
CLI e2e tests (8, 6)	1m 35s
WebUI End-to-end tests (5)	2m 32s
WebUI End-to-end tests (6)	2m 33s
CLI e2e tests (8, 7)	3m 32s
WebUI End-to-end tests (7)	3m 34s
WebUI End-to-end tests (8)	2m 34s
	1h 7m 11s

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