feat: switch to yafti for first boot

based on what's done in bluefin
& https://github.com/ublue-os/yafti#running-from-a-containerfile

etc/profile.d/ublue-firstboot.sh

@@ -1,6 +1,6 @@
 if test "$(id -u)" -gt "0" && test -d "$HOME"; then
-    if test ! -e "$HOME"/.config/ublue/firstboot-done; then
+    if test ! -e "$HOME"/.config/autostart/ublue-firstboot.desktop; then
         mkdir -p "$HOME"/.config/autostart
         cp -f /etc/skel.d/.config/autostart/ublue-firstboot.desktop "$HOME"/.config/autostart
     fi
-fi
+fi

etc/skel.d/.config/autostart/ublue-firstboot.desktop

@@ -1,8 +1,8 @@
 [Desktop Entry]
-Name=Ublue Desktop FirstBoot Setup
-Comment=Sets up Ublue Desktop Correctly On FirstBoot
-Exec=/usr/bin/ublue-firstboot
+Name=uBlue First Boot Setup
+Comment=Sets up uBlue Desktop Correctly On FirstBoot
+Exec=/usr/bin/yafti /etc/yafti.yml
 Icon=org.gnome.Terminal
 Type=Application
 Categories=Utility;System;
-Name[en_US]=startup
+Name[en_US]=startup