K8S: Add migration tutorial (#3973)

* docs(k8s): add tutorial kubernetes migration

* docs(k8s): migration tutorial

* Apply suggestions from code review

Co-authored-by: Rowena Jones <36301604+RoRoJ@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: nerda-codes <87707325+nerda-codes@users.noreply.github.com>

* Update tutorials/migrating-from-another-managed-kubernetes-service-to-scaleway-kapsule/index.mdx

---------

Co-authored-by: Rowena Jones <36301604+RoRoJ@users.noreply.github.com>
Co-authored-by: nerda-codes <87707325+nerda-codes@users.noreply.github.com>

Author: 3 people