feat: use user and theme attributes

horsch/neovim/default.nix

@@ -1,4 +1,4 @@
-{ pkgs, ... }:
+{ pkgs, theme, ... }:
 let
   pkg_src = pkgs;
 in
@@ -160,7 +160,7 @@ in
             ${builtins.readFile ./telescope.lua }
 
             ${builtins.readFile ./themes.lua }
-            vim.opt.background = 'dark'
+            vim.opt.background = '${theme}'
 
             ${builtins.readFile ./project-nvim.lua }
             ${builtins.readFile ./dap.lua }