Update operator.md: Removed KUDO

[guettli]

KUDO was not updated for three years. The docs should not mention it.

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[T-Lakshmi]

Preview page

[T-Lakshmi]

KUDO repository: https://github.com/kudobuilder/kudo

[T-Lakshmi]

Verified other third party projects status mentioned in page and seems remaining all are active state.
I think its good to cleanup the inactive sites to keep up to date.

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 6e3ac1bbb16cb8564b41201727b88fed42251877

[stmcginnis]

Seems like the right thing to do.

/lgtm

[reylejano]

/approve

[k8s-ci-robot]

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