feat: refactoring configuration with options to make it more modular

lib/default.nix

@@ -0,0 +1,18 @@
+{lib, ...}: {
+  colmenaSystem = import ./colmenaSystem.nix;
+  macosSystem = import ./macosSystem.nix;
+  nixosSystem = import ./nixosSystem.nix;
+  attrs = import ./attrs.nix {inherit lib;};
+  scanPaths = path:
+    builtins.map
+    (f: (path + "/${f}"))
+    (builtins.filter # find all overlay files in the current directory
+      
+      (
+        f:
+          f
+          != "default.nix" # ignore default.nix
+          && f != "README.md" # ignore README.md
+      )
+      (builtins.attrNames (builtins.readDir path)));
+}