docs: nix package instead of custom fetch

[sand4rt]

No description provided.

[Copilot]

🟡 Changes recommended

The updated Nix snippet uses unquoted attribute access for a hyphenated name (zen-nvim), which will fail to evaluate and should be corrected in the documentation.

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Pull request overview

Updates the Nix NVF configuration example in the README to use the nixpkgs-provided zen.nvim plugin package instead of a custom fetchFromGitHub + buildVimPlugin snippet.

Changes:

• Replaces the README’s NVF plugin package example with the nixpkgs vimPlugins entry.

File summaries

File	Description
README.md	Simplifies the NVF Nix example by referencing the nixpkgs vim plugin package rather than an inline fetch/build expression.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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