refactor: start i3/hyprland in home-manager instead of NixOS

home/linux/hyprland/hypr-conf/scripts/startup

@@ -10,8 +10,9 @@ for _prs in "${_ps[@]}"; do
 	fi
 done
 
-# Set wallpaper
-swaybg --output '*' --mode fill --image ~/.config/wallpapers/default_wallpaper &
+# Set wallpaper via a wallpaper.service
+# it will by start by home-manager automatically, do not need to restart it here.
+# systemctl --user restart wallpaper.service
 
 # Lauch notification daemon (mako)
 ~/.config/hypr/scripts/notifications &