Stale Italian localization of federation page

[sftim]

This is a Bug Report

Problem:
The Italian localization includes a very old page https://k8s.io/it/docs/concepts/cluster-administration/federation/ that does not render but still exists in the source. That page can trigger build errors during local development if you make a change that isn't compatible, even though the actual rendered site would not change.

Proposed Solution:
Remove content/it/docs/concepts/cluster-administration/federation.md

Page to Update:

https://k8s.io/it/docs/concepts/cluster-administration/federation/ (kinda)

Additional Information:
/language it
/priority backlog

[k8s-ci-robot]

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