add: v2 banner to startpage

Author: Aylur

src/content/docs/index.mdx

@@ -12,6 +12,8 @@ hero:
     - text: GitHub
       link: https://github.com/Aylur/ags
       icon: github
+banner:
+  content: 🚀 <a href="https://github.com/Aylur/ags/pull/504">AGS v2</a> is soon to be merged, consider checking it before jumping into this documentation if you are starting out.
 ---
 
 import { Card, CardGrid } from '@astrojs/starlight/components';