What would you like to be added:

The last update to https://gateway-api.sigs.k8s.io/contributing/#presentations-and-talks was 5 years ago and needs to be updated with KubeCon talks and presentations.

Why this is needed:

We've had some great talks since then, and they should be added to help promote the project. It would be nice to update this after every KubeCon, but at least once a year would suffice.