Update _config.yml

Update cell timeouts as they are close to 60s

Author: mmcky

lectures/_config.yml

@@ -5,7 +5,7 @@ description: This website presents a set of lectures on python programming for e
 
 execute:
   execute_notebooks: "cache"
-  timeout: 60
+  timeout: 120
 #   run_in_temp: true
 
 html: