[Docs] Post-deployment Hardening Checklist

Opening this to make a place to jot down some basics for hardening the installation once deployed. Obviously these things are outside the scope of this project but this repo feels a timely place to communicate some basics. Nothing here should be misconstrued as security advice. Caveat lector.

• Attempt to connect to your MongoDB using Compass with the connection string mongodb://api.example.com:27017 (update based on domain var). If you're able to access it without authenticating, shell into the droplet and change ports key in /home/reaction/reaction-development-platform/reaction/docker-compose.yml to expose, change the setting value to "27017" and restart the API with make stop-reaction && make start-reaction for settings to take effect.
• Navigate a browser to admin.example.com (update based on domain var) and register a new user to assume the Owner role. Ownership is immediate and no service restarts are required.
• Enable the BasicAuth middleware for traefik.domain.example. Detailed instructions here.
• Review the .env files in each of the projects and modify PLACEHOLDERS necessary.

Please add additional suggestions below.