Fix preview for Nextra 2 blogpost [skip ci] (#1814)

Author: dimaMachina

website/pages/blog/nextra-2.mdx

@@ -4,7 +4,7 @@ tags: [nextra, nextjs, react]
 authors: [dimitri, shuding]
 date: 2023-01-24
 description: Here are what the new version of Nextra 2 Framework includes.
-image: https://nextra.site/og.jpeg
+image: https://nextra.site/opengraph-image.jpeg
 ---
 
 import NextImage from 'next/image'