docs: Update readme with explore traces info #9508

Job	Run time
Benchmark	9m 31s
Benchmark	9m 31s
Build	1m 46s
Build	1m 46s
Run integration tests (test-e2e)	24m 25s
Run integration tests (test-e2e)	20m 50s
Lint	3m 13s
Lint	3m 13s
Run integration tests (test-integration-poller)	9m 44s
Run integration tests (test-integration-poller)	9m 44s
Run Unit Tests (test-with-cover-pkg)	3m 13s
Run Unit Tests (test-with-cover-pkg)	3m 13s
Run integration tests (test-e2e-deployments)	13m 34s
Run integration tests (test-e2e-deployments)	13m 34s
Run Unit Tests (test-with-cover-tempodb)	15m 46s
Run Unit Tests (test-with-cover-tempodb)	15m 46s
Build technical documentation	20s
Build technical documentation	20s
Run integration tests (test-e2e-serverless)	7m 8s
Run integration tests (test-e2e-serverless)	7m 8s
Run Unit Tests (test-with-cover-tempodb-wal)	11m 17s
Run Unit Tests (test-with-cover-tempodb-wal)	11m 17s
Run Unit Tests (test-with-cover-others)	12m 21s
Run Unit Tests (test-with-cover-others)	12m 21s
Check jsonnet & tempo-mixin	1m 1s
Check jsonnet & tempo-mixin	1m 1s
Vendor check	1m 16s
Vendor check	1m 16s
	3h 45m 35s

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