@whitequark I am certifiably an idiot.
I carefully rendered my static website *to the wrong folder*, so of course it could not be found. Now all is well, and sub1.swiss-soccer.net is alive and kicking.
Thank you for your patience and advice over the last couple of days.
I have a website in several sections that is currently on github pages, and now I think I have the opportunity to make each section its own repo and have each one be displayed on a subdomain, with the content on codeberg and using grebedoc.dev, and it looks as if I should be able to make it work. Thank you for making this possible.
Now, before I close all those tabs, I need to write down what ended up working...