update frontmatter description for workers/sites page (#18126)

Author: dario-piotrowicz

src/content/docs/workers/configuration/sites/index.mdx

@@ -2,9 +2,7 @@
 pcx_content_type: navigation
 title: Workers Sites
 head: []
-description: Use [Cloudflare Pages](/pages/) for hosting full-stack applications
-  instead of Workers Sites. Do not use Workers Sites for new projects.
-
+description: Use [Workers Static Assets](/workers/static-assets/) to host full-stack applications instead of Workers Sites. Do not use Workers Sites for new projects.
 ---
 
 import { Render } from "~/components"