Update README.md

README.md

@@ -39,7 +39,7 @@ cacao is a computation engine for adaptive optics control.
 
 Topic                        |  Chat room                             |  Documentation             |
 -----------------------------|----------------------------------------|--------------------|
-How to use cacao ?           | [![Gitter](https://badges.gitter.im/cacao-org/community.svg)](https://gitter.im/cacao-org/community)  Community | [Online documentation]( http://CACAO-org.github.io/cacao/index.html )  |
+How to use cacao ?           | [![Gitter](https://badges.gitter.im/cacao-org/community.svg)](https://gitter.im/cacao-org/community)  Community | [Online documentation]( http://cacao-org.github.io/docs )  |
 Configuring computer system  | [![Gitter](https://badges.gitter.im/cacao-org/RTCconfig.svg)](https://gitter.im/cacao-org/RTCconfig)  Hardware / OS setup | [RTC setup]( https://github.com/cacao-org/cacao/wiki/Seeting-up-a-RTC-system ) |
 Software development         | [![Gitter](https://badges.gitter.im/cacao-org/codedev.svg)](https://gitter.im/cacao-org/codedev)      Developers | [coding standards]( http://CACAO-org.github.io/cacao/page_coding_standards.html ) and  [Online documentation]( http://CACAO-org.github.io/cacao/index.html )|