Remove externals from product yaml file

Author: RebeccaTamachiro

src/content/products/secrets-store.yaml

@@ -16,7 +16,3 @@ resources:
   community: https://community.cloudflare.com/
   dashboard_link: https://dash.cloudflare.com/?to=/:account/secrets-store
   discord: https://discord.gg/cloudflaredev
-
-externals:
-  - title: Cloudflare homepage
-    url: https://cloudflare.com