fix broken url

Author: KameiKojirou

src/content/docs/index.mdx

@@ -12,7 +12,7 @@ hero:
       icon: right-arrow
       variant: primary
     - text: GitHub Repository
-      link: https://starlight.astro.build
+      link: https://github.com/grow-graphics/gd
       icon: external
 ---
 
@@ -23,7 +23,7 @@ import { Card, CardGrid } from '@astrojs/starlight/components';
 <CardGrid stagger>
 	<Card title="Documentation" icon="open-book">
 	Coming soon!
-		(https://learn.grow.graphics/guides/example)
+		[Our Documentation](https://learn.grow.graphics/documentation)
 	</Card>
 	<Card title="Godot Game Engine" icon="add-document">
 		- [Godot Game Engine](https://godotengine.org)