added theme as toml

modules/home/editor/default.nix

@@ -1,13 +1,14 @@
-{ pkgs, ... }: {
-  home.packages = with pkgs; [
-    nil
-    marksman
-  ];
-
+{ pkgs, ... }: 
+let
+  themes = {
+    rosepine = builtins.fromTOML "${builtins.readFile ./rose_pine_dawn.toml}";
+  };
+in {
   programs.helix = {
     enable = true;
     defaultEditor = true;
+    extraPackages = with pkgs; [ nil marksman ];
     settings = import ./helix-config.nix;
-    themes = import ./helix-theme.nix;
+    themes = themes;
   };
 }