Remove "License for Free Trial" section

This is implemented entirely in Marketo and license-app.

README.md

@@ -5,18 +5,6 @@ forwards the relevant information to Marketo via its REST API.
 
 ## Handlers
 
-### License for Free Trial
-
-```text
-"Free Trial" -> Recurly -> webhooks.io -> marketo-tools -> Marketo
-```
-
-TODO (rspeicher): Explain purpose.
-
-**Relevant issues:**
-
-- [Webhook to send code for free trial](https://gitlab.com/gitlab-com/www-gitlab-com/issues/423)
-
 ### Newsletter
 
 ```text