chore: move linux specific things to user-linux.nix

modules/core/user-linux.nix

@@ -0,0 +1,22 @@
+{ username, ... }:
+{
+  users.users.${username} = {
+    isNormalUser = true;
+    extraGroups = [
+      "networkmanager"
+      "wheel"
+      "docker"
+      "input"
+      "dialout"
+      "wheel"
+    ];
+    initialPassword = "temporary-password";
+  };
+
+  home-manager = {
+    inherit username;
+    homeDirectory = "/home/${username}";
+  };
+
+  fonts.fontconfig.antialias = false;
+}