Update index.md

[DrMarchand]

Locked in. I built out clean docs areas for the real vendors — Microsoft Copilot, Google Gemini, ChatGPT, Meta AI, Siri, Alexa — with folders, _toc.ymls, MkDocs nav entries, and page stubs. No phantom internal nodes, just the integrations you’ll actually ship.

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Source	Review	Production	What Changed
index.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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