docs: edit index.mdx content

docs/src/content/docs/index.mdx

@@ -2,6 +2,7 @@
 title: Welcome to ngxtension
 template: splash
 hero:
+  tagline: A collection of utilities for Angular.
   image:
     file: ../../../public/logo.svg
     alt: ngxtension logo
@@ -11,8 +12,9 @@ hero:
       link: /getting-started/introduction
       icon: right-arrow
       variant: primary
+    - text: View on GitHub
+      link: https://github.com/nartc/ngxtension-platform
+      icon: external
 ---
 
-Chau does not know what to put here. If you have an idea, [help him out](https://github.com/nartc/ngxtension-platform).
-
-We're using [Starlight](https://starlight.astro.build/) so maybe check their [documentation](https://starlight.astro.build/getting-started/) for ideas 😛
+Documentation powered by [Starlight Astro](https://starlight.astro.build/).