Hallucinate some kinda flake business

configuration.nix

@@ -2,11 +2,11 @@
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running 'nixos-help').
 
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, inputs, ... }:
 with lib;
 
 let
-  unstable = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz") { config = { allowUnfree = true; }; };
+  unstable = import inputs.nixpkgs-unstable { inherit (config.nixpkgs) config; };
 in
 
 {
@@ -257,4 +257,7 @@ in
   # Before changing this value read the documentation for this option
   # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
   system.stateVersion = "25.05"; # Did you read the comment?
+
+  # Enable flakes
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
 }