new nixos dotfile layout

Signed-off-by: Michał Czyż <mike@c2yz.com>

hosts/modules/nh.nix

@@ -0,0 +1,12 @@
+{ username, ... }:
+{
+  programs.nh = {
+    enable = true;
+    flake = "/home/${username}/.files";
+    clean = {
+      enable = true;
+      dates = "weekly";
+      extraArgs = "--keep-since 3d --keep 3";
+    };
+  };
+}