fix Zulip link

Author: reint-fischer

docs/community/index.md

@@ -40,12 +40,12 @@ If you are doing any kind of Lagrangian modelling and/or analysis check out the
 
 ```{image} https://img.shields.io/badge/Zulip-50ADFF?style=for-the-badge&logo=Zulip&logoColor=white
 :width: 30%
+:target: https://clam-community.zulipchat.com/
 ```
 
 +++
 
 ```{button-link} https://clam-community.github.io/
-:click-parent:
 :color: secondary
 :expand: