Moved back to headline for topics.

README.md

@@ -5,18 +5,29 @@ features to manage customer communication via several channels like telephone,
 facebook, twitter, chat and e-mails. It is distributed under the GNU AFFERO
 General Public License (AGPL) and tested on Linux, Solaris, AIX, FreeBSD,
 OpenBSD and Mac OS 10.x. Do you receive many e-mails and want to answer them
-with a team of agents? You're going to love Zammad!
+with a team of agents?
 
+You're going to love Zammad!
 
-* Installing & Getting Started - https://zammad.org/documentation
 
-* Screenshots - https://zammad.org/screenshots
+## Installing & Getting Started
 
-* Features - https://zammad.com/features
+https://zammad.org/documentation
 
-* Tour - https://zammad.com/tour
 
-* REST API - https://zammad.org/documentation/api/intro
+## Screenshots
+
+https://zammad.org/screenshots
+
+
+## REST API
+
+https://zammad.org/documentation/api/intro
+
+
+## Contributing
+
+https://zammad.org/participate
 
 
 Thanks! ❤️ ❤️ ❤️