Remove deprecated code

.github/workflows/documentation.yml

docs/content/deprecation/features.md

docs/content/migration/v2-to-v3.md

...ce/dynamic-configuration/kubernetes-crd-definition-v1.yml

...t/reference/dynamic-configuration/kubernetes-crd-rbac.yml

...amic-configuration/traefik.containo.us_ingressroutes.yaml

...c-configuration/traefik.containo.us_ingressroutetcps.yaml

...c-configuration/traefik.containo.us_ingressrouteudps.yaml

...ynamic-configuration/traefik.containo.us_middlewares.yaml

...mic-configuration/traefik.containo.us_middlewaretcps.yaml

...-configuration/traefik.containo.us_serverstransports.yaml

...nfiguration/traefik.containo.us_serverstransporttcps.yaml

...dynamic-configuration/traefik.containo.us_tlsoptions.yaml

.../dynamic-configuration/traefik.containo.us_tlsstores.yaml

...ic-configuration/traefik.containo.us_traefikservices.yaml

docs/content/reference/static-configuration/cli-ref.md

docs/content/reference/static-configuration/env-ref.md

docs/content/routing/providers/kubernetes-gateway.md

integration/fixtures/k8s/01-traefik-crd.yml

integration/fixtures/k8s/03-ingressroute-containous.yml