feat(website): add OG image for social sharing

Copy og-image.png to public assets and add OpenGraph and Twitter Card
meta tags to the root layout so link previews work across all pages.

packages/website/src/routes/__root.tsx

@@ -12,6 +12,11 @@ export const Route = createRootRoute({
       { charSet: 'utf-8' },
       { name: 'viewport', content: 'width=device-width, initial-scale=1' },
       { name: 'theme-color', content: '#0a0a0a' },
+      { property: 'og:site_name', content: 'Paseo' },
+      { property: 'og:type', content: 'website' },
+      { property: 'og:image', content: 'https://paseo.sh/og-image.png' },
+      { name: 'twitter:card', content: 'summary_large_image' },
+      { name: 'twitter:image', content: 'https://paseo.sh/og-image.png' },
     ],
     links: [
       { rel: 'icon', href: '/favicon.ico', sizes: '48x48' },