docs(home): add the product index as the Mintlify home page

[anubhavsinghmaar]

What

The Mintlify site has no way back to the rest of the documentation. It opens straight into the Kane CLI introduction, and every other product lives on the Docusaurus stack at /support/docs/ — so a reader who lands on Kane CLI docs is stuck there.

This makes /docs serve the same product index that /support/docs/ serves.

Link rules on the new home page:

• Kane CLI → /docs/<slug> — stays inside Mintlify (8 links)
• everything else → /support/docs/<slug>/ — goes to Docusaurus (105 links)

Changes

1. docs/index.mdx is now the product index (mode: "custom", 19 product cards)

Generated from src/pages/docs.js on testmuCom so the two grids stay in parity — same cards, same order, same labels, same NEW/BETA pills, same link targets. Verified identical: 19 cards / 113 links on both.

Styling follows the existing docs/index-backup.mdx (hero + search button + lg:grid-cols-4 card grid). Products that already had an icon there keep it; the new cards use cloud (Browser Cloud), terminal (Kane CLI) and robot (Agent Testing Platform).

2. The Kane CLI introduction moves to docs/kane-cli-introduction.mdx

Content is unchanged — only the frontmatter slug: / is dropped so the URL derives from the path, like every other page. The slug matches the one the Docusaurus stack already uses for the same page.

⚠️ Its URL changes from /docs to /docs/kane-cli-introduction. A Mintlify redirect cannot cover this, because /docs is now the home page. Anything currently pointing at /docs expecting the Kane CLI landing page (npm README, the kane-cli repo, CLI help output) will land on the product index instead — one extra click, not a 404.

3. docs.json navigation

docs/index becomes the first page of the Docs tab, above the Kane CLI group; docs/kane-cli-introduction replaces docs/index as the group's first entry. The sidebar on every Kane CLI page now shows a "TestMu AI Documentation" link back to the index.

Verification

Local mint dev:

URL	Serves
/docs	TestMu AI Documentation (new index)
/docs/kane-cli-introduction	Kane CLI (moved, renders correctly)
/docs/kane-cli-installation	Installing Kane CLI (unchanged)

• docs.json is valid JSON; every docs/* nav entry resolves to a real file.
• All 8 /docs/* links on the index resolve to existing .mdx files.
• Screenshotted the index and a Kane CLI page — grid, pills and sidebar all render correctly.

Merge order

Merge this before the companion Docusaurus PRs (#3298 → stage, #3299 → testmuCom), which link to /docs/kane-cli-introduction.

🤖 Generated with Claude Code