Revert "Login and UKI updates (#1860)"

This reverts commit f2021a95a4.

install/preflight/guard.sh

@@ -22,11 +22,5 @@ done
 pacman -Qe gnome-shell &>/dev/null && abort "Fresh + Vanilla Arch"
 pacman -Qe plasma-desktop &>/dev/null && abort "Fresh + Vanilla Arch"
 
-# Must have limine installed
-command -v limine &>/dev/null || abort "Limine bootloader"
-
-# Must have btrfs root filesystem
-[ "$(findmnt -n -o FSTYPE /)" = "btrfs" ] || abort "Btrfs root filesystem" 
-
 # Cleared all guards
 echo "Guards: OK"