Update hero image in index.mdx to enhance visual representation

Author: sanjay7178

src/content/docs/index.mdx

@@ -5,7 +5,7 @@ template: splash
 hero:
   tagline: Securing browsers with open source detection and response solutions
   image:
-    file: https://api.iconify.design/mdi:security-network.svg?color=%230284c7&width=140&height=140
+    file: https://api.iconify.design/carbon:ibm-cloud-security-compliance-center.svg?color=%230284c7&width=140&height=140
     alt: BrowserSec security shield icon
   actions:
     - text: KubeBrowse