Create a technical project handoff plan for fxa-email-server

[tublitzed]

This will be a deep dive into the existing fxa email service. We need to document what it would take specifically in order for our team to take this over.

Specifically, let's try to answer the following:

• What specifically needs to change for us to take on ownership of this project?
• Are there things we'd like to change/improve upon over the longterm that may not make sense for the initial handoff? If so, what?
• How much time do we anticipate spending doing the work to take over the project?
• How much time do we anticipate spending to maintain the project?
• Who else do we need to coordinate with here in order to make sure this handoff is succesful?
• What kinds of monitoring/metrics exist around the project?

[jrconlin]

Google doc.

https://docs.google.com/document/d/1bfz83Wl5fD435nNLlzIWbuschpLPBXX17CNA9dUfp7w/edit?usp=sharing

[vladikoff]

Let me know if you have any questions about it!

[jrconlin]

@vladikoff None yet. Things look fairly straight forward aside from some more private/ops questions like "which provider are we running?". Docs and code look good, thanks!