Update AWS Integration page to include cloud-provider and k8s-storage

[addyess]

Addresses documentation needs in issue https://github.com/charmed-kubernetes/kubernetes-docs/issues/743

• AWS Cloud Storage and Cloud Providers
• GCP Cloud Storage and Cloud Providers
• Azure Cloud Storage and Cloud Providers
• VSphere Cloud Storage and Providers in https://github.com/charmed-kubernetes/kubernetes-docs/pull/762

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