Update finetuning_advanced example

[mwalmsley]

Code drift + lack of uploaded images broke the finetuning advanced example for everyone but me.

This PR

• Updates the replication script and finetuning_advanced.py example with the latest API
• Adds an example slurm script
• Adds data download links and instructions for the 60k relevant ring candidate images

Should reach around 86% accuracy when running the example (requires an excellent GPU or reduced batch size).