website: update meta image. (#1735)

<img width="643" alt="image"
src="https://github.com/user-attachments/assets/41729fc8-5e00-48d4-9c83-f148b602e3e2">

website/.vitepress/config.mts

@@ -217,7 +217,7 @@ export default defineConfig({
 
     const title = `${fm.title || siteData.title} | ${fm.titleTemplate || 'ElectricSQL'}`
     const description = fm.description || siteData.description
-    const image = `https://electric-sql.com${fm.image || '/img/postgres-sync.jpg'}`
+    const image = `https://electric-sql.com${fm.image || '/img/meta/why-fetch-when-you-can-sync.jpg'}`
 
     head.push(['meta', { name: 'twitter:card', content: 'summary_large_image' }])
     head.push(['meta', { name: 'twitter:image', content: image }])