Nixpkgs `lib`

1st chunk of `doc/lib.md`

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# Nixpkgs `lib` {#id-1.4}

```{=include=} chapters
functions.md
module-system/module-system.chapter.md
```

Title: Nixpkgs `lib`

Summary

This section introduces the Nixpkgs `lib` library, which includes functions and the module system. It also includes links to more detailed explanations of functions and the module system.