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/pages/ContributePage.tsx

@@ -1,9 +1,11 @@
+import { Breadcrumbs } from '../components/Breadcrumbs';
 import { REPO, REPO_CONDUCT, REPO_CONTRIBUTING } from '../links';
 
 export function ContributePage() {
   return (
     <div className="wrap page">
       <article className="docs-content">
+        <Breadcrumbs items={[{ label: 'Home', to: '/' }, { label: 'Contribute' }]} />
         <h1>Contribute</h1>
         <p className="intro">
           LexAI is a monorepo: Chrome, VS Code, CLI, website, and a shared library. Please follow