I'm closing the server down, but I'm uploading a torrent of everything you'll need to host it yourself. On Debian, minetest.conf belongs in /etc/minetest/ and .minetest belongs in /var/games/minetest-server/. You can get the subdomain lainchan.ftp.sh for free on https://freedns.afraid.org/
. I unregistered it so it's first come first serve now. Otherwise, you can change the domain.
If you need some help setting up the server, I'd be happy to help. You may also want to check the corresponding thread on lainchan.