FIX: config needs to be julia kernel for code-cells to be setup

Author: mmcky

lectures/_config.yml

@@ -68,7 +68,7 @@ sphinx:
     tojupyter_urlpath: "https://julia.quantecon.org/"
     tojupyter_image_urlpath: "https://julia.quantecon.org/_static/"
     tojupyter_kernels:
-      python3:
+      julia:
         kernelspec:
           display_name: "Julia"
           language: julia