Suzy-Q cable is used to low-level interact with newer chromebooks firmware, you can for example disable firmware write protection (previously it was done with a screw), debug hardware and unbrick chromebook

you can read on it a bit more in official Google docs: https://chromium.googlesource.com/chromiumos/third_party/hdctools/+/HEAD/docs/ccd.md

If you only need a bare minimum, and don’t plan to heavily use CI/CD, container/packages registries, integrations with other tools i would go with gitea/forgejo (you can always use external tools on top), else i would use selfhosted Gitlab, it has pretty much all the things you could imagine to need with software development and deployment

you can play on multiplayer just fine, as long as server have enabled offline-mode

For minecraft you can just use a offline mode in pretty much every 3rd party launcher, like SKLauncher

i miss old plex (~2016), when it was actually focused on providing local content, good thing jellyfin exist

Your docker install is too old and it doesn’t support that docker-compose version, you probably should update your docker to more recent one (are you running debian 10 on default repositories?), or you could remove logging references from file (these x-logging lines in each service and whole section on top of file)