Add support for HTTPs in dev and production via nginx

[brian-nguyen]

🎟️ Ticket(s): Closes #

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👷 Changes

• Add command to generate self-signed certificate and key
• Add command to start nginx container - mounts config and keys

🔦 Testing Instructions

Generate keys with make https
Modify the make nginx and nginx.conf according to the comments for development.
Test run the server PORT=9090 go run main.go
Go to http://localhost/start and https://localhost/start to confirm the setup works.

[coveralls]

Coverage remained the same at 66.756% when pulling 3dd68c7 on brian/https into a40948a on master.