Default disable email service with note in docs explaining rationale … #4

Job	Run time
publish_alpha_release / bump_version	6s
publish_alpha_release / update_changelog	0s
publish_alpha_release / tag_prerelease	3s
publish_alpha_release / build_and_publish_pypi	0s
build_and_publish_docker / build_and_publish_docker	31s
	40s

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