fix: update GitHub link in index.md to point to the correct repository

Author: shoma-mano

docs/src/index.md

@@ -12,7 +12,7 @@ hero:
       link: /010-min-ssr
     - theme: alt
       text: GitHub
-      link: https://github.com
+      link: https://github.com/chibivue-land/chibinuxt
   image:
     src: /kawaiko_nuxt_dot.png