Okay I get why it doesn't work for me. I'm using PussTheCat's Docker image, and their instance doesn't have this either. Sorry for the inconvenience, but I'm hosting all of my stuff on one server and would prefer everything to be containerized.
It probably works with the container. Just set up wildcard DNS (doesn't involve the container server) and then get your certificate (doesn't involve the container server). Redirect all incoming requests for your domain to breezewiki (can be done regardless of container) and you're all done. It's okay if you don't want to, you're still allowed to be on the instance list. But it does improve the user experience a LOT, since people don't have to manually rewrite the URL. Cadence