Unify Training pages

[Robadob]

From mentioning this on Slack, there seems to be agreement that the two course's respective pages (atleast the registration link/button) should be more consistent. Maybe events which have registration too. Not sure if the best way to achieve this would be with a specific registration-event template or similar.

https://rse.shef.ac.uk/training/workshop/2022-11-16-deep-learning-with-tensorflow-in-python

https://rse.shef.ac.uk/training/workshop/2022-10-31-git-zero-hero