kubectl-kustomize: add page

[girdharagrawalbro]

Adds documentation for the kubectl kustomize command.

This command builds Kubernetes resources using a kustomization file, which is essential for managing configurations across different environments.

Examples included:

• Build resources from current/specific directory
• Display output with pipe to less
• Build from remote URLs
• Save output to file
• Use load restrictor options

Documentation reference: https://kubernetes.io/docs/reference/kubectl/generated/kubectl_kustomize/

[Managor]

Do not use the Fixes keyword if the PR does not fully fix the issue! It will cause the issue to be automatically closed when the PR is merged