2026-02-02: Update prerequisites

Posted in the Matrix chat, so that BC can respond:

> In the next course iteration, we also need to teach about login. 
> 
> This means the prerequisites need to be updated: we cannot any longer expect learners to find a Zoom room on an HPC cluster (or can we?). 
> 
> However, as a standalone course, we can keep expecting this (?).

- Wait for BCs reply
- Update the prerequisites to reflect this.