docs(Getting Started): Improve overview and explain options #6635

Job	Run time
Agent unit tests	1m 15s
Build docker image	5m 47s
CLI unit tests	36s
config-e2e	1s
API Server unit tests	2m 39s
WebUI unit tests	1m 53s
CLI smoke tests (local)	45s
CLI smoke tests (docker)	46s
Tracetesting API Server (NATS)	4m 23s
Tracetesting API Server (InMemory)	3m 54s
Test examples (collector)	44s
Test examples (tracetest-jaeger)	41s
Test examples (tracetest-opensearch)	7m 38s
CLI e2e tests (8, 0)	1m 15s
CLI e2e tests (8, 1)	1m 30s
Test examples (tracetest-tempo)	41s
WebUI End-to-end tests (1)	2m 29s
CLI e2e tests (8, 2)	1m 32s
WebUI End-to-end tests (2)	2m 30s
Test examples (tracetest-provisioning-env)	41s
WebUI End-to-end tests (3)	2m 36s
CLI e2e tests (8, 3)	1m 36s
WebUI End-to-end tests (4)	2m 33s
CLI e2e tests (8, 4)	1m 22s
WebUI End-to-end tests (5)	3m 31s
CLI e2e tests (8, 5)	2m 33s
WebUI End-to-end tests (6)	2m 37s
CLI e2e tests (8, 6)	1m 25s
WebUI End-to-end tests (7)	2m 40s
CLI e2e tests (8, 7)	3m 24s
WebUI End-to-end tests (8)	2m 29s
	1h 8m 26s

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