try this for now

config/colorscheme.nix

@@ -0,0 +1,14 @@
+{
+  colorschemes = {
+    catppuccin = {
+      enable = true;
+
+      settings = {
+        flavour = "mocha";
+
+        # Needed to keep terminal transparency, if any
+        transparent_background = false;
+      };
+    };
+  };
+}

config/default.nix

@@ -1,9 +1,14 @@
-{
-  options = {
-    # Enable relative line numbers
-    number = true;
-    relativenumber = true;
 
+{ lib, ... }:
 
-  };
-}
+let
+  definitions = lib.attrNames (
+    lib.filterAttrs
+      (filename: kind:
+        filename != "default.nix"
+        && (kind == "regular" || kind == "directory")
+      )
+      (builtins.readDir ./.)
+  );
+in
+lib.mkMerge (map (file: import ./${file}) definitions)

config/options.nix

@@ -0,0 +1,7 @@
+{
+    opts = {
+        # Enable relative line numbers
+        number = true;
+        relativenumber = true;
+    };
+}

default.nix

@@ -0,0 +1,26 @@
+_:
+
+{
+  imports = [
+    ./config
+    # ./plugins
+  ];
+
+  config = {
+    # Use <Space> as leader key
+    # globals.mapleader = " ";
+
+    # Set 'vi' and 'vim' aliases to nixvim
+    viAlias = true;
+    vimAlias = true;
+
+    # Setup clipboard support
+    clipboard = {
+      # Use xsel as clipboard provider
+    #   providers.xsel.enable = true;
+
+      # Sync system clipboard
+      register = "unnamedplus";
+    };
+  };
+}

flake.nix

@@ -52,7 +52,7 @@
             nixvim.legacyPackages.${system}.makeNixvimWithModule {
               inherit pkgs;
 
-              module = ./config;
+              module = ./.;
 
               extraSpecialArgs = specialArgs // {
                 inherit pkgs;