What happened:

Dear authors and/or contributors (cc'ing @philipc2 @rajeeja and @erogluorhan ), the nightly builds of this cookbook have been failing for the last several months. The issue seems like a simple broken link.

Could you please have a look at it?

Minimal Complete Verifiable Example:

Latest nightly build as of the creation of this issue.

Anything else we need to know?:

If you think it is due to Pythia infrastructure or something else other than the cookbook itself, please let us know.