Replace dataset registration in guide with link to new topic dataset and software registration in PURE

[Jolien-S]

On 17-12-2024 the new topic 'Dataset and software registration in PURE' was included in the handbook. The same content already existed in the guide What data assets should you publish and what data assets should you archive?. This content needs to be replaced with a link to the topic mentioned above.

In addition, the topic needs to be reviewed and some things may need to be rephrased, in particular 'archive' with 'repository'.