Add minimal nginx config

[muellerj]

First of all thanks for an amazing project. When I was setting this up on my own machine, I had to piece together some of the solutions in other issues, #27 being prominently helpful.

Maybe including a sample nginx config can help other people get set up faster.

[ekzhang]

Thank you! Unfortunately I'm not super familiar with Nginx and am not able to adequately review this PR right now.

We can revisit in the future when we think about supporting self-hosting.

[ekzhang]

Alright, unfortunately I'm closing this because the reverse proxy is only one part of a working self-hosted setup. In addition to the gRPC forwarding and TLS termination, you'll also need to set up:

• private networking between instances
• graceful shutdown
• Redis server (if persisted, or doing a multi-server deployment)

Also this configuration hardcodes /sshx.SshxService/Channel, which isn't necessarily going to be the only gRPC streaming route. We'll want flexibility in the future to change this.

[muellerj]

No worries - this was but my naïve attempt at getting this to work on my home box. If anyone has a more thorough/complete setup, I'm happy to switch.