📝 Add Webhook test app suggestion (#1813)

Added section for a simple free tool for debugging webhooks easily. Hope
thats ok!

apps/docs/editor/blocks/integrations/webhook.mdx

@@ -97,6 +97,8 @@ By default, the Webhook block will wait 10 seconds for the 3rd party service to
 
 The Webhook block request fail or didn't seem to trigger? Make sure to check the [logs](/results/overview#logs). If you still can't figure out what went wrong, shoot me a message using the chat button directly in the tool 👍
 
+You can use tools like [Webhook Tester](https://webhook-test.com/) to see payloads of webhooks for debugging and troubleshooting.
+
 ### Webhook is not executed in the right order?
 
 That is expected, Typebot actually computes all the blocks between each input blocks from a server before displaying anything.