chore: add stackblitz playground link

Author: danielroe

README.md

@@ -11,7 +11,7 @@
 Plug-and-play image optimization for Nuxt apps. Resize and transform your images using built-in optimizer or your favorite images CDN.
 
 - [📖  Read Documentation](https://image.nuxt.com)
-- [👾  Playground](https://githubbox.com/nuxt/image/tree/main/example)
+- [👾  Playground](https://stackblitz.com/github/nuxt/image/tree/main/example)
 
 ## Features