feat: Update the instructor notes for Fall 2024

[cdkharris]

Summary of updates by file:

• _config.yml Remove a duplicate variable and replace the node name with one that will play nicely with qhost
• _episodes/* Minor changes to correct the job scripts- Ideally some variables would be changed/added upstream but SGE is not planned to be supported in the future and there isn't a simpler way to do these.
• _episodes/17-parallel.md Add instructions for loading the python3 module- ideally this should be a new snippet but they're hoping to replace snippets with something else when the upstream lesson gets overhauled.
• UCL snippets
  • modules/software-dependencies.snip New modules now loads dependancies automatically in most cases. Yay!
  • modules/wrong-gcc-version.snip New modules lets us streamline this example. Yay!
  • scheduler/print-sched-variables.snip Correct SGE job scripts for the new environment variables lesson

[heatherkellyucl]

Just noting I've also looked through these, looks good.