remove unneded options, add users.nix

modules/other/users.nix

@@ -0,0 +1,22 @@
+{config, ...}: let
+  inherit (config.meta.mainUser) username;
+in {
+  users = {
+    mutableUsers = false;
+    users = {
+      ${username} = {
+        isNormalUser = true;
+        extraGroups = [
+          "wheel"
+          "networking"
+          "video"
+          "networkmanager"
+          "audio"
+          "nix"
+        ];
+        hashedPasswordFile = "/etc/passwords/cr";
+      };
+      root.hashedPasswordFile = "/persist/passwords/root";
+    };
+  };
+}