Add llms.txt to site

[fubuloubu]

Describe

Add LLM-friendly documentation features and organize the site so that it efficiently describes the high-level use cases for all of our products, frameworks, and open source packages/SDKs

see: ApeWorX/sphinx-ape#25

Specification

No response

Dependencies

No response

[linear]

APE-1984 Add llms.txt to site