[users] Simple Gemini server for testing in the current directory?

[mailinglists at ngalt.com]

One thing that I like about HTTP is that there are oodles of ways to spin up a simple server for testing on localhost. Things like `python3 -m http.server` and `caddy run` are what I'm thinking of. Since this is Gemini and not bare-bones HTTP, It'd have to handle key generation.

Is there a server like that yet for Gemini that runs on macOS?