remove parcels_contributing from sidebar

Author: reint-fischer

docs/community/index.md

@@ -17,14 +17,6 @@ Discussions <https://github.com/Parcels-code/parcels/discussions>
 Issues <https://github.com/Parcels-code/parcels/issues>
 ```
 
-```{toctree}
-:caption: parcels_contributions
-:maxdepth: 1
-:hidden:
-
-Repository <https://github.com/Parcels-code/parcels_contributions>
-```
-
 Parcels users and developers interact in a vibrant community on a few different platforms. Check out the cards below to see how you can interact with us.
 
 `````{grid} 1 2 2 2