chore(website): Update Events page to add Kubeflow Summit KubeCon NA 2025

[varodrig]

Chore description

website: Update event page with Kubeflow

Page to be updated:
Future events -> https://www.kubeflow.org/events/upcoming-events/

Event's name: Kubeflow Summit North America (co-located event at KubeCon NA 2025)
Add a link to the event's page published at KubeCon
https://events.linuxfoundation.org/kubecon-cloudnativecon-north-america/co-located-events/kubeflow-summit/

We have the kubeflow summit as co-located event at KubeCon NA 2025.

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[varodrig]

@thesuperzapper anything else we should add?
cc @chasecadet @StefanoFioravanzo
@andreyvelich @franciscojavierarceo

[varodrig]

/area website

[varodrig]

/good-first-issue

[google-oss-prow]

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[solanyn]

I'll have a go at this!

/assign