content/conf: update changed config value

content/conf.py

@@ -45,7 +45,7 @@
 #jupyter_execute_notebooks = "off"
 #jupyter_execute_notebooks = "auto"   # *only* execute if at least one output is missing.
 #jupyter_execute_notebooks = "force"
-jupyter_execute_notebooks = "cache"
+nb_execution_mode = "cache"
 
 # Add any paths that contain templates here, relative to this directory.
 #templates_path = ['_templates']