doc/subscriber_guide: add `Email notifications` section #974

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Job	Run time
check_auxiliary_files (3.10)	2m 15s
check_python (3.9, ubuntu-latest)	14m 46s
check_python (3.10, ubuntu-latest)	14m 15s
check_python (3.11, ubuntu-latest)	10m 54s
check_python (3.12, ubuntu-latest)	14m 1s
check_deployment	2h 38m 19s
	3h 34m 30s