Add GitHub Action to generate LLM-optimized documentation

[seriouscoderone]

Summary

• Integrates osodevops/docusaurus-llm-docs@v1 into the existing D-deploy-to-gh-pages.yml deploy workflow
• Generates LLM-friendly documentation following the llmstxt.org standard as part of every deploy
• Files are served alongside the site — no separate workflow needed

How it works

The LLM docs generation step runs between the Docusaurus build and the gh-pages deploy. It converts the built HTML pages into clean markdown and copies the output into ./build/ so they get deployed with the rest of the site:

• /llms.txt — structured index of all documentation pages with links
• /llms-full.txt — complete documentation in a single markdown file (for LLM context windows)
• /markdown.zip — individual markdown files organized by section

Uses build directory discovery (not sidebar parsing) since keridoc uses Docusaurus autogenerated sidebars which the action doesn't yet support natively.

Tested on fork (seriouscoderone/keridoc)

• 167 pages successfully processed in ~5 seconds
• llms-full.txt: 2.9MB, 42,952 lines
• llms.txt: 24KB index with links to all pages
• markdown.zip: 868KB archive with 293 files

Test plan

• Workflow runs successfully on fork
• All 167 documentation pages discovered and converted
• llms.txt contains structured index with correct URLs
• llms-full.txt contains complete documentation content
• markdown.zip contains individual markdown files
• Verify files are accessible at weboftrust.github.io/keridoc/llms.txt after deploy

🤖 Generated with Claude Code

[seriouscoderone]

@henkvancann @kordwarshuis please review