Refactor of live_exam_os for ubuntu

live_exam_os/.env.example

live_exam_os/.gitignore

live_exam_os/Dockerfile

live_exam_os/Makefile

live_exam_os/README.md

live_exam_os/build.sh

live_exam_os/config/00-bootloader/limine.cfg

live_exam_os/config/00-bootloader/limine.conf

live_exam_os/config/00-bootloader/limine_casper.conf

live_exam_os/config/00-bootloader/limine_pxe.conf

live_exam_os/config/01-initramfs/init

live_exam_os/config/01-initramfs/init_no_luks

live_exam_os/config/01-packages_install/packages

...-customisation/etc/NetworkManager/NetworkManager.conf.bak

...ation/etc/NetworkManager/conf.d/10-default-wired.conf.bak

...tc/NetworkManager/conf.d/10-globally-managed-devices.conf

...g/02-customisation/etc/NetworkManager/conf.d/dns.conf.bak

...workManager/system-connections/wifi.nmconnection.example1

...workManager/system-connections/wifi.nmconnection.example2

live_exam_os/config/02-customisation/etc/challenge