docs(install): new install sections & updated getting started #6422

Job	Run time
Agent unit tests	2m 5s
API Server unit tests	3m 33s
Build docker image	6m 9s
config-e2e	1s
WebUI unit tests	1m 55s
CLI unit tests	1m 32s
CLI smoke tests (local)	50s
CLI smoke tests (docker)	44s
Test examples (collector)	52s
Test examples (tracetest-jaeger)	48s
Test examples (tracetest-opensearch)	7m 30s
Tracetesting API Server (InMemory)	3m 55s
Tracetesting API Server (NATS)	3m 49s
Test examples (tracetest-tempo)	47s
Test examples (tracetest-provisioning-env)	41s
CLI e2e tests (8, 0)	2m 34s
WebUI End-to-end tests (1)	2m 31s
CLI e2e tests (8, 1)	2m 29s
WebUI End-to-end tests (2)	2m 39s
CLI e2e tests (8, 2)	2m 51s
WebUI End-to-end tests (3)	2m 32s
CLI e2e tests (8, 3)	2m 37s
WebUI End-to-end tests (4)	2m 32s
CLI e2e tests (8, 4)	2m 37s
WebUI End-to-end tests (5)	2m 32s
CLI e2e tests (8, 5)	3m 59s
WebUI End-to-end tests (6)	3m 30s
CLI e2e tests (8, 6)	3m 2s
WebUI End-to-end tests (7)	2m 29s
CLI e2e tests (8, 7)	4m 46s
WebUI End-to-end tests (8)	2m 33s
	1h 21m 24s

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