Add nix and flatpak to system packages

config.scm

@@ -3,6 +3,7 @@
   (gnu packages)
   (gnu packages shells)
   (gnu packages bash)
+	(gnu packages package-management)
   (nongnu packages linux)
   (nongnu system linux-initrd))
 (use-service-modules cups desktop networking ssh xorg)
@@ -35,6 +36,8 @@
   (packages (append (list
   	bash
 		zsh
+		flatpak
+		nix
 	) %base-packages))
 
   ;; Below is the list of system services.  To search for available