Update README.md

Author: mariobehling

README.md

@@ -14,11 +14,9 @@
 
 The front end for the **Open Event Server**
 
-[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy)
-
 **API Documentation:**
 
-- Every installation of the **Open Event Server** project includes API docs, (e.g. here on the test install [https://open-event.dokku.fossasia.org](https://open-event.dokku.fossasia.org)).
+- Every installation of the **Open Event Server** project includes API docs
 - A hosted version of the API docs is available in the `gh-pages` branch of the **Open Event Server** repository at [http://api.eventyay.com](http://api.eventyay.com)
 
 ## Communication