[fix] nvim: system module brok plugins

The architecture of nixvim doesn't let me use NixOS modules T-T, I need
to use manual imports instead.

nvim/default.nix

@@ -1,14 +1,5 @@
-{
-  lib,
-  pkgs,
-  config,
-  helpers,
-  ...
-}: let
-  # Force inputs to be included
-  nixvim = import ./nixvim.nix {inherit lib pkgs config helpers;};
-in {
+args: {
   imports = [./options.nix];
 
-  config.programs.nixvim = nixvim.config;
+  config.programs.nixvim = (import ./nixvim.nix args).config;
 }