Feature: Add LLM-friendly content endpoints

[neoskx]

Summary

• Adds a build-time content generator that produces llms.txt index, llms-full.txt (all docs concatenated), and per-page raw markdown files at /{slug}/index.md
• Every documentation page now has its source markdown accessible by appending index.md to the page URL (e.g., /getting-started/index.md, /types/basic-types/index.md)
• Integrates into the deploy workflow as a GitHub Action that runs before the Astro build

Motivation

LLM agents and tools increasingly look for llms.txt to discover documentation in a machine-readable format. Serving raw markdown alongside rendered pages lets both LLMs and
developers access structured content without scraping HTML.

What's included

File	Purpose
.github/actions/generate-llm-content/	Node.js action that parses all docs, generates llms.txt, llms-full.txt, and copies raw markdown to public/{slug}/index.md
.github/workflows/deploy.yaml	Runs the generator before the Astro build
.gitignore	Ignores generated files in public/
package.json	Adds generate:llms script

Local development

cd .github/actions/generate-llm-content && npm install && npm run start:local
cd ../../.. && npm run dev
# Visit http://localhost:4321/llms.txt
# Visit http://localhost:4321/getting-started/index.md

Test plan

• npm run start:local generates 22 files without errors
• llms.txt links all use correct base URL
• Every link in llms.txt resolves to an existing file in public/
• Raw markdown at /{slug}/index.md matches source file exactly (including frontmatter)
• Deploy workflow runs the action successfully