Fix broken webhooks guide link (#338)

Author: davidzhao

packages/livekit-server-sdk/README.md

@@ -120,7 +120,7 @@ svc.deleteRoom('myroom').then(() => {
 
 ## Webhooks
 
-The JS SDK also provides helper functions to decode and verify webhook callbacks. While verification is optional, it ensures the authenticity of the message. See [webhooks guide](https://docs.livekit.io/guides/webhooks) for details.
+The JS SDK also provides helper functions to decode and verify webhook callbacks. While verification is optional, it ensures the authenticity of the message. See [webhooks guide](https://docs.livekit.io/home/server/webhooks/) for details.
 
 LiveKit POSTs to webhook endpoints with `Content-Type: application/webhook+json`. Please ensure your server is able to receive POST body with that MIME.