Update to (somewhat?) dendritic pattern

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

> Atomic commits? Never heard of them!

secrets/secrets.nix

@@ -0,0 +1,14 @@
+let
+  weckyy702 = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPHlqOxre3cZWtTRaQWqn0zKjsnFZGCI4qdbpAeaQE2g";
+  users = [ weckyy702 ];
+
+  keith = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKrauXP79zUm2FlVj3HRm+C8ufYAABiIoe68OCGbIm+2";
+  tux = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFB7bh6ioZrTSR0AkKvJ1qxVWX0kwcM8yeHghTYFGpqZ";
+  systems = [ keith tux ];
+in
+{
+  "nas-creds.age" = {
+    publicKeys = systems ++ users;
+    armor = true;
+  };
+}