Refresh homepage

[ethanpalm]

Documentation changes

Based on figma.

Closes https://linear.app/mintlify/issue/DOC-164/update-the-introduction-page

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Note

Low Risk
Low risk since changes are limited to docs site theming/copy and a homepage MDX layout refresh; main risk is minor UX regressions around the new search button behavior and styling.

Overview
Homepage refresh: Replaces the index.mdx intro page hero/cards with a new structured homepage layout (hero + sectioned link tiles) and introduces a SearchBar button that opens site search by clicking #search-bar-entry or dispatching a Cmd/Ctrl+K key event.

Config/copy tweaks: Updates docs.json to use the luma theme (from almond) and adjusts navbar link text to “Talk with us”; also tweaks page keywords and marks decorative hero background images as aria-hidden.

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