fixup! create a wrangler.toml file for the user in case one is not already present

add a comment for the cache kv binding

Author: dario-piotrowicz

packages/cloudflare/templates/defaults/wrangler.jsonc

@@ -8,5 +8,13 @@
   "assets": {
     "directory": ".open-next/assets",
     "binding": "ASSETS"
-  }
+  },
+  "kv_namespaces": [
+    // Create a KV binding with the binding name "NEXT_CACHE_WORKERS_KV"
+    // to enable the KV based caching:
+    // {
+    //   "binding": "NEXT_CACHE_WORKERS_KV",
+    //   "id": "<BINDING_ID>"
+    // }
+  ]
 }