feat: added index description

docs/content/index.mdx

@@ -6,11 +6,21 @@ template: splash
 
 import {Card, CardGrid} from '@astrojs/starlight/components';
 
+## What is Aquila?
+
+Aquila is a service running inside the execution block. It acts as the gateway to external services. Any request that needs to enter or exit the execution environment is routed through Aquila.
+
+Aquila keeps internal workflows updated so the execution service knows what’s happening. It communicates with actions to receive their configurations, structures, and much more.
+
+---
+
+Refer to the guides if you want to work on or with Aquila.
+
 <CardGrid stagger>
-    <Card title='<a href="setup/setup.md">Setup</a>' icon="document">
+    <Card title='<a href="Guide/setup.md">Setup</a>' icon="document">
         View the setup guide for aquila.
     </Card>
-    <Card title='<a href="dev/dev.md">Develop</a>' icon="rust">
+    <Card title='<a href="Guide/dev.md">Develop</a>' icon="seti:rust">
         Development for aquila.
     </Card>
 </CardGrid>