Clarify how CodeRabbit seat licenses work

[jmacdotorg]

The docs could use a lot more clarity on how seat licenses work—especially, but not limited to, the case of an organization that has only public repositories, or a mix of public and private repositories.

Points to clarify here:

• What do seat licenses even do?
• How many should I buy, if I'm buying any?
• Do seat licenses come into play at all for public repositories? What if my org has a mix of public and private repositories?
• What CodeRabbit products do seat licenses apply to?
  • Cloud-based CodeRabbit?
  • Self-hosted CodeRabbit?
  • The VSCode extension?
  • Others?

[linear]

ENG-1650 Clarify how CodeRabbit seat licenses work

[traycerai]

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