change from mono-home-manager to full flake multi-system configuration

hosts/t440p/configuration.nix

@@ -0,0 +1,60 @@
+# Edit this configuration file to define what should be installed on
+# your system.  Help is available in the configuration.nix(5) man page
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+
+{ config, pkgs, lib, ... }:
+
+{
+  imports = [ # Include the results of the hardware scan and modules
+    ./hardware-configuration.nix
+    ./../../modules/desktop.nix
+    ./../../modules/secrets.nix
+    ./../../modules/security.nix
+    ./../../modules/unfree.nix
+    ./../../modules/users.nix
+    #./../../modules/wifi.nix
+  ];
+
+  networking.hostName = "t440p";
+  networking.networkmanager.enable = true;
+
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+  boot.initrd.luks.devices."luks-1c04b05d-0ddf-429a-95c3-1f5fdb570207".device = "/dev/disk/by-uuid/1c04b05d-0ddf-429a-95c3-1f5fdb570207";
+
+  # Set time zone and internationalisation
+  time.timeZone = "Europe/Berlin";
+  i18n.defaultLocale = "de_DE.UTF-8";
+  i18n.extraLocaleSettings = {
+    LC_ADDRESS = "de_DE.UTF-8";
+    LC_IDENTIFICATION = "de_DE.UTF-8";
+    LC_MEASUREMENT = "de_DE.UTF-8";
+    LC_MONETARY = "de_DE.UTF-8";
+    LC_NAME = "de_DE.UTF-8";
+    LC_NUMERIC = "de_DE.UTF-8";
+    LC_PAPER = "de_DE.UTF-8";
+    LC_TELEPHONE = "de_DE.UTF-8";
+    LC_TIME = "de_DE.UTF-8";
+  };
+
+  console.keyMap = "de";
+
+  # List packages installed in system profile.
+  # To search, run: $ nix search wget
+  environment.systemPackages = with pkgs; [
+    wget 
+    curl 
+    git 
+    vim
+    tree
+  ];
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # 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?
+
+}