Revise the code review best practice pages

[jmacdotorg]

Use the guide authored by @smb06 to create one or more short and easily readable best practices pages specific to performing code reviews with Code Rabbit. These should cover our recommendations regarding every stage of the workflow, starting with how you configure your git-platform organization or repositories to best work with CodeRabbit.

[linear]

ENG-1569 Revise the code review best practice pages

[traycerai]

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[jmacdotorg]

This task mutated a great deal into an "initial configuration guide", now in review.