Generate llms.txt file

[JoviDeCroock]

This will enable the creation of a Preact/signals MCP and so on

[rschristian]

Sorry, two more things (though feel free to merge anyhow, idk if either are issues per se):

• <toc></toc>
  • We have this in most docs, will it be problematic? It's not amidst any examples, so it might be harmless
• Heading hierarchy
  • The heading levels are bit weird, as you create a document title heading with ## but then each document has it's own heading as #. This comes from the very top of the preview llms.txt:

# Preact Documentation

This file contains comprehensive documentation for Preact v10, a fast 3kB alternative to React with the same modern API.

Generated on: 2025-07-12T06:52:21.658Z
Source: https://github.com/preactjs/preact-www

## Overview

Preact is a fast, lightweight alternative to React that provides the same modern API in a much smaller package. This documentation covers all aspects of Preact v10, including components, hooks, server-side rendering, TypeScript support, and more.

---

## API Reference

**Description:** Learn more about all exported functions of the Preact module

**Source:** content/en/guide/v10/api-reference.md

# API Reference

...

## Component

...

Depending on how tools parse this doc, I can see them getting a bit lost. We might need to adjust heading levels for each document, potentially stripping out the main heading from the content body too (as you create one yourself)?