- update to use librem5-base v52
- install usbguard config / new subpackage
- move xorg.conf to new x11 subpackage
- refactor udev rule install to just install everything available from
librem5-base upstream
- use purism's shipmode script, see:
https://source.puri.sm/Librem5/linux/-/merge_requests/333#note_195511