Update manifest.json (#17526)

Author: nathanmadams

cisco_duo/manifest.json

@@ -2,7 +2,7 @@
   "manifest_version": "2.0.0",
   "app_uuid": "8d3e0e2f-df52-4a12-a976-3ded71553a3a",
   "app_id": "cisco-duo",
-  "display_on_public_website": false,
+  "display_on_public_website": true,
   "tile": {
     "overview": "README.md#Overview",
     "configuration": "README.md#Setup",
@@ -72,4 +72,4 @@
     "homepage": "https://www.datadoghq.com",
     "sales_email": "info@datadoghq.com"
   }
-}
+}