fix(iso): disable force import of ZFS root

update flake.lock

feat(iso): switch desktop environment from GNOME to Plasma 6

refactor(iso): simplify nvidia and boot configuration

docs: add project documentation

feat(iso): switch desktop environment from Plasma 6 to GNOME

refactor(iso): update plasma6 module and add bluetooth support

feat: add NixOS live ISO configuration for NVIDIA and Plasma 6