AWS Cloud Costs are not fully documented

[mattray]

https://www.opencost.io/docs/configuration/aws#aws-cloud-costs is missing configuration of the CUR export/Athena access.

The CUR/Athena configuration from Kubecost's docs would make a good start: https://docs.kubecost.com/install-and-configure/install/cloud-integration/aws-cloud-integrations#cost-and-usage-report-integration

[msafwankarim]

Template provided for AWS cloud-integration.json also doesn't work with the latest version. We have to use the one from Kubecost docs