website: add machine-readable documentation index (llms.txt)

[Sridhar1030]

Description of Changes

Introduce llms.txt and llms-full.txt as Hugo custom output formats following the
llmstxt.org standard, providing a machine-readable documentation
index for LLM consumption.

What's included:

• llms.txt — curated index of all docs pages with titles, URLs, and descriptions
• llms-full.txt — expanded version with full inline page content for RAG pipelines
• Both files auto-regenerate on every Hugo build (including live reload during development)
• Legacy (v1) docs are separated into an "Optional" section per the llms.txt spec

Files changed:

• config.toml — added LLMS and LLMSFull custom output formats
• layouts/index.llms.txt — template for /llms.txt
• layouts/index.llmsfull.txt — template for /llms-full.txt
• layouts/partials/llms-pages.html — recursive partial for curated index
• layouts/partials/llms-full-pages.html — recursive partial for full content

Results

Related Issues

Closes: #4349

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[Arhell]

/ok-to-test