fix: bypass SPA routing for /llms.txt link

[Copilot]

Docusaurus's client-side Link (to prop) intercepts navigation to /llms.txt and attempts SPA routing — failing because it's a static file, not a React page. A hard browser refresh works because it bypasses the router entirely.

Changes

• homepageData.js: Replace to: '/llms.txt' with href: '/llms.txt' on the LLM-Native Docs card so the SmartLink component falls through to a plain <a> tag.
• Sections.jsx: Pass href={card.href} alongside to={card.to} in the documentation cards SmartLink to wire through the new prop.

// Before — triggers SPA router, 404s on static file
{ to: '/llms.txt', title: 'LLM-Native Docs', ... }

// After — plain <a href="..."> bypasses router
{ href: '/llms.txt', title: 'LLM-Native Docs', ... }

SmartLink already handles this: to → Docusaurus Link (SPA), no to + href → <a> (direct navigation).

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