Update _config.yml

Author: MartinSchobben

_config.yml

@@ -11,7 +11,7 @@ bibtex_bibfiles:
 
 execute:
   # To execute notebooks via a Binder instead, replace 'cache' with 'binder'
-  execute_notebooks: binder
+  execute_notebooks: cache
   timeout: 600
   allow_errors: False # cells with expected failures must set the `raises-exception` cell tag