Security improvements to docker deployment

[shadyeip]

• Added reverse proxy to forward 443 to 5000.
• Updated app services to bind to localhost, only exposing reverse proxy to the host.
• Added self-signed cert generation.
• Added ability to use custom certs. Simply create a directory called certs in the nginx directory, and add cert (nginx.crt) and key (nginx.key) to it.

[turnernator1]

Hi @shadyeip

Thanks for the PR! Looks like some awesome improvements.

We will review and aim to merge ASAP.

[shadyeip]

There's a bug in nginx conf file that prevents screenshot uploads, I'll push a fix when I get a chance. Otherwise, this has been working well for us.