some fixes

modules/neovim/_colorscheme.nix

@@ -0,0 +1,14 @@
+{ ... }:
+{
+    programs.nixvim = {
+      colorscheme = "winterly";
+
+      # Make palette available to this module but
+      # also for other configuration (e.g. lualine)
+      extraFiles."lua/dnsc/palette.lua".source = ./extraFiles/palette.lua;
+
+      # Set custorscheme in neovims runtimepath so that neovim
+      # discovers it automatically
+      extraFiles."colors/winterly.lua".source = ./extraFiles/winterly.lua;
+    };
+}