docs: add remote install method for snapshot-controller

[anisurrahman75]

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Hi @anisurrahman75. Thanks for your PR.

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[xing-yang]

This won't work. https://github.com/kubernetes-csi/external-snapshotter/deploy/kubernetes/snapshot-controller does not exist.

[anisurrahman75]

@xing-yang, This path contains a kustomization.yaml file, so kubectl kustomize can fetch and build it remotely, similar to the CRD and CSI driver examples.