Update external workshop instructions for new server

We will need to update these instructions given our infrastructure changes: https://github.com/AlexsLemonade/training-modules/blob/master/external-workshops/using-training-materials.md

Open external-workshops/using-training-materials.md and read the current instructions from start to finish. Identify the references affected by the infrastructure changes, confirm the new server details from the repository context, and update the document so the workshop setup instructions match the current server; done means the instructions are accurate and complete.

Written by the indexing model from the issue text.