feat(website): add search-intent titles, FAQ schema, and breadcrumbs

Give Google unique snippets and FAQ rich results, and keep robots/sitemap from being cached as HTML.

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/website/src/components/SiteFooter.tsx

@@ -8,6 +8,7 @@ export function SiteFooter() {
         <p style={{ margin: 0 }}>© {new Date().getFullYear()} LexAI · MIT</p>
         <div style={{ display: 'flex', gap: '1rem', flexWrap: 'wrap' }}>
           <Link to="/docs">Docs</Link>
+          <Link to={{ pathname: '/', hash: 'faq' }}>FAQ</Link>
           <Link to="/contribute">Contribute</Link>
           <Link to="/community">Community</Link>
           <a href={REPO} target="_blank" rel="noreferrer">