refactor: rename utils to lib'

lib/default.nix

@@ -0,0 +1,10 @@
+{ lib }:
+
+let
+  fs = import ./fs.nix { inherit lib; };
+  hosts = import ./hosts.nix { inherit lib; };
+  secrets = import ./secrets.nix { inherit lib; };
+
+  dotsPath = ../dots;
+in
+fs // hosts // secrets // { inherit dotsPath; }