chore: we use MDXv3 now

Signed-off-by: Claudio W <cwunder@gnome.org>

Author: ovflowd

README.md

@@ -9,7 +9,7 @@
 </p>
 
 <p align="center">
-  <a href="https://nodejs.org">Node.js</a> Website built using Next.js with TypeScript, SCSS and MDXv2
+  <a href="https://nodejs.org">Node.js</a> Website built using Next.js with TypeScript, SCSS and MDXv3
 </p>
 
 <p align="center">