feature: added caddy for easier setup and exposing

[dhruva71]

Adds caddy to the docker compose; adds a caddy folder with a Caddyfile for easier setup. This makes it easy to expose over the internet, and has automatic HTTPS support.

[netroy]

I understand why you'd want this addition to the repo, but plenty of folks are using nginx and traefik instead.
If we make a change like this, we need to include those services as well, and somehow use only one of the three via profiles.

[dhruva71]

Understood. I'll work on it to add support for those two as far as possible. My initial view was ease of setup, but I hadn't considered that viewpoint. Thanks!