chore(alerts): add docs redirect (#16029)

Author: shellmayr

redirects.js

@@ -1340,6 +1340,10 @@ const userDocsRedirects = [
     source: '/platforms/javascript/guides/nextjs/usage/',
     destination: '/platforms/javascript/guides/nextjs/capturing-errors/',
   },
+  {
+    source: '/product/new-monitors-and-alerts/alerts/:path*',
+    destination: '/product/alerts/:path*',
+  },
 ];
 
 /**