bug: update docket service to support new self hosted nginx config

[Laphatize]

Since we are using Cloudflare tunneling for the new infrastructure we are no longer able to utilize autogenerated subdomains.

Currently, docket hosts a terminal on an open port on the host machine and increments accordingly. Our current NGINX config mapped PORT.ctfguide.com to localhost:PORT.

This shouldn't require any changes to https://github.com/ctfguide-tech/docket but we need to update the NGINX config.

[Laphatize]

We will just be using a custom proxy.