When using a minimal template based sys-usb, `qubes-usb-proxy` appears to be an actual requirement, otherwise USB devices fail to attach. I'm not sure if this is also a bug (i.e., package `qubes-input-proxy-sender` should depend on `qubes-usb-proxy`), but it's definitely a documentation issue.
- Unify and normalize Fedora and Debian docs
- Deduplicate content
- Cross-link pages
- Move content to correct pages
- Use more accurate and intuitive terms and names
FixesQubesOS/qubes-issues#5284