treewide: Refactor in order to clean up flake.nix

configuration/hardware-specific/vm.nix

@@ -0,0 +1,17 @@
+{lib, ...}: {
+  users.users.tlater.password = "insecure";
+
+  # Disable graphical tty so -curses works
+  boot.kernelParams = ["nomodeset"];
+
+  # Sets the base domain for nginx to localhost so that we
+  # can easily test locally with the VM.
+  services.nginx.domain = lib.mkOverride 99 "localhost";
+
+  # Use the staging secrets
+  sops.defaultSopsFile = lib.mkOverride 99 ../../keys/staging.yaml;
+
+  # # Set up VM settings to match real VPS
+  # virtualisation.memorySize = 3941;
+  # virtualisation.cores = 2;
+}