added welcome email after subscription #494

Job	Run time
vars	1s
docker / docker	2m 36s
tests / test (macos-latest)	13m 6s
sites / Deploy sites	7m 36s
tests / test (ubuntu-latest)	12m 59s
tests / e2e-test (macos-latest)	11m 29s
electron / electron (macos-latest)	9m 16s
tests / e2e-test (ubuntu-latest)	8m 30s
electron / electron (ubuntu-latest)	9m 45s
tests / api-e2e-test	7m 46s
electron / electron (windows-latest)	19m 0s
	1h 42m 4s

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