added quadlet-nix input, created initial ixion config, created wrapper around quadlets

also wrote some doucumentation about quadlets, nothing too comprehesive
though as the wrapper might get removed later

modules/machine/ixion/configuration.nix

@@ -0,0 +1,16 @@
+{
+  lib,
+  pkgs,
+  userName,
+  ...
+}: {
+  imports = [ ];
+
+  # Enable flakes for NixOS
+  nix.settings.experimental-features = ["nix-command" "flakes"];
+
+  # Custom kernel/boot stuff
+  boot.kernelPackages = pkgs.linuxPackages_latest;
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+}