Caddy reverse proxy with Github Auth

Let's us reverse proxy an HTTP service with Caddy, along with an authentication and authorization layer in front of it.

1. Create a GitHub application to use OAuth
2. Get an API key from Cloudflare to use LetsEncrypt to setup HTTPS
3. cp .env.sample .env and update the values
4. Run the Caddy server. Try ./start.sh to see what this would look like