Add basic developer docs for integration setup and config #1733

Job	Run time
Run test group of app_analytics_test	19m 24s
Run test group of datasources_test	11m 8s
Run test group of event_analytics_test	23m 4s
Run test group of integrations_test	11m 29s
Run test group of metrics_analytics_test	14m 33s
Run test group of notebooks_test	14m 29s
Run test group of panels_test	15m 9s
Run test group of trace_analytics_test	27m 32s
	2h 16m 48s

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