Provide guidance to Instructors about commonly-encountered technical issues

[tobyhodges]

From 2024-07-18 community call.

The lesson would benefit from addition of some Instructor Notes, providing guidance to Instructors about hwo to troubleshoot issues learners may encounter with SSH key setup/other installation stuff, and other problems you can run into e.g. learners going off script and trying to install stuff as soon as they gain access to the cluster. There will probably be more...