fix(srv): replace snippet with link to dedicated doc

Author: SamyOubouaziz

faq/serverless-containers.mdx

@@ -103,20 +103,7 @@ Refer to our dedicated page about [Serverless Containers limitations and configu
 
 ## How can I copy an image from an external registry to Scaleway Container Registry?
 
-You can copy an image from an external registry by [logging in to the Scaleway Container Registry](/containers/container-registry/how-to/connect-docker-cli/) using the Docker CLI, and by copying the image as shown below:
-
-```sh
-docker pull alpine:latest
-docker tag alpine:latest rg.fr-par.scw.cloud/example/alpine:latest
-docker push rg.fr-par.scw.cloud/example/alpine:latest
-```
-
-Alternatively, you can use tools such as [Skopeo](https://github.com/containers/skopeo) to copy the image:
-
-```sh
-skopeo login rg.fr-par.scw.cloud -u nologin -p $SCW_SECRET_KEY
-skopeo copy --override-os linux docker://docker.io/alpine:latest docker://rg.fr-par.scw.cloud/example/alpine:latest
-```
+You can copy an image from an external registry by [logging in to the Scaleway Container Registry](/containers/container-registry/how-to/connect-docker-cli/) using the Docker CLI, or using open source third party tools such as Skopeo. Refer to the [dedicated documentation](/serverless/containers/api-cli/migrate-external-image-to-scaleway-registry/) for more information.
 
 ## Can I whitelist the IPs of my containers?