Aggregation: Document Redfish aggregation

Adds documentation on Redfish aggregation. Includes an overview of its
current capabilities as well as how to enable and use the feature.

Signed-off-by: C

Aggregation: Document Redfish aggregation

Adds documentation on Redfish aggregation. Includes an overview of its
current capabilities as well as how to enable and use the feature.

Signed-off-by: Carson Labrado <clabrado@google.com>
Change-Id: Ife8dae921e2d9772e7676dc927b41f7dfc00c047

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