docs: Add split staging and prod doc

[Sherlock113]

What does this PR address?

Fixes #(issue)

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[hyperlint-ai]

PR Change Summary

Added documentation for managing split staging and production environments in BentoCloud.

• Introduced a new section on split staging and production environments in the documentation.
• Provided guidelines for switching between organizations in the BentoCloud console and CLI.
• Included instructions for transferring resources between organizations.
• Outlined automation patterns for deployments across staging and production environments.

Modified Files

• docs/source/scale-with-bentocloud/administering/index.rst

Added Files

• docs/source/scale-with-bentocloud/administering/split-staging-and-prod.rst

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