Update to (somewhat?) dendritic pattern

Heavily inspired by https://github.com/Doc-Steve/dendritic-design-with-flake-parts.

> Atomic commits? Never heard of them!

modules/hosts/keith/users/weckyy702/mount-nas.nix

@@ -0,0 +1,16 @@
+{ inputs, ... }: {
+  flake.modules.nixos.keith = { config, ... }: {
+    age.secrets."nas-creds".file = "${inputs.secrets}/nas-creds.age";
+
+    imports = with inputs.self.factory; [
+      (mount-cifs {
+        host = "duke.veltnet";
+        resource = "home";
+        destination = "/home/weckyy702/duke";
+        credentials_path = "${config.age.secrets.nas-creds.path}";
+        UID = "weckyy702";
+        GID = "users";
+      })
+    ];
+  };
+}