Website: Delete extensions/v1beta1 in docs

[inductor]

This is a Feature Request

Since v1.16, extensions/v1beta1 has been deleted and it should not be used in docs

What would you like to be added
The following pages should be edited due to this deletion.

• [ ] https://github.com/kubernetes/website/blob/master/content/en/docs/concepts/overview/kubernetes-api.md
• [ ] https://github.com/kubernetes/website/blob/master/content/en/docs/concepts/workloads/controllers/deployment.md
• [x] https://github.com/kubernetes/website/blob/master/content/en/docs/concepts/workloads/controllers/replicaset.md
• [ ] https://github.com/kubernetes/website/blob/master/content/en/docs/reference/access-authn-authz/admission-controllers.md
• [ ] https://github.com/kubernetes/website/blob/master/content/en/docs/reference/access-authn-authz/extensible-admission-controllers.md
• [ ] https://github.com/kubernetes/website/blob/master/content/en/docs/reference/kubectl/conventions.md
• [ ] https://github.com/kubernetes/website/blob/master/content/en/docs/reference/using-api/api-overview.md
• [ ] https://github.com/kubernetes/website/blob/master/content/en/docs/tasks/access-application-cluster/ingress-minikube.md
• [x] https://github.com/kubernetes/website/blob/master/content/en/docs/tasks/manage-kubernetes-objects/declarative-config.md
• [x] https://github.com/kubernetes/website/blob/master/content/en/docs/tasks/manage-kubernetes-objects/imperative-config.md

Why is this needed
extensions/v1beta1 is deleted in 1.16

Comments

[sftim]

/kind cleanup

/priority important-soon
(I think)

[sftim]

If you are looking at this as potentially something to contribute to, it's OK to suggest a PR that fixes only one page, or only some pages.
If you do that please mention “Partial fix for issue #18809” in the description of your PR.

[gavinfish]

@makocchi-git thanks for contribution here.
Could you please share which pages would you take? Let us make the assignment more clear and help other contributors easily start their work.

[makocchi-git]

@gavinfish Thank you for your comments.
I wrote the target file into PR titles.
And I will write to the comment about netlify demo pages and original pages to enable checking the diff easily.