Major config overhaul: use custom modules, setup for multi-host config, and less boilerplate

modules/user/userInfo/default.nix

@@ -0,0 +1,18 @@
+{ config, lib, pkgs, ... }:
+
+{
+  options = {
+    userSettings = {
+      name = lib.mkOption {
+        default = "";
+        description = "User full name";
+        type = lib.types.str;
+      };
+      email = lib.mkOption {
+        default = "";
+        description = "User email";
+        type = lib.types.str;
+      };
+    };
+  };
+}