FEATURE REQ: Deployment/security architecture

[AdamLeonSmith]

It would be useful to have a short description on how we recommend HAs deploy the docker containers, and the security architecture.

For example - how many users can be supported by a single container with spec X

I'm assuming no data leaves the browser, but it would be good to state that so that it is clear why we don't need TLS/SSL; why backups aren't necessary etc; that there's no persistence and no need for auth.

These statements can then be supported by tests.