feat(config): sync smtp and email config to remote

[sweatybridge]

What kind of change does this PR introduce?

part 5 of #2814

What is the new behavior?

Syncs email and custom smtp config to remote.

Additional context

Add any other context or screenshots.

[coveralls]

Pull Request Test Coverage Report for Build 11793949664

Details

• 13 of 27 (48.15%) changed or added relevant lines in 1 file are covered.
• 14 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.05%) to 59.764%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/start/start.go	13	27	48.15%

Files with Coverage Reduction	New Missed Lines	%
internal/gen/keys/keys.go	5	12.9%
internal/start/start.go	9	68.43%

Totals
Change from base Build 11772251670:	-0.05%
Covered Lines:	6381
Relevant Lines:	10677

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💛 - Coveralls

[sweatybridge]

@avallete I'm moving email template to a separate PR because adding Content field also requires updating the local nginx/kong server where these templates are served.