Describe team roles alongside org member roles

[RyanSkonnord]

Add description of team roles. Split table of organization membership in two, deleting the "admin" column and moving affected rows to a new "Team Member Roles" subsection. Demoted the "Organization Member Roles" section to an h3 so that "Team Member Roles" can sit next to it.

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Name	Status	Preview	Updated
sentry-docs	✅ Ready (Inspect)	Visit Preview	Oct 4, 2022 at 11:27PM (UTC)

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This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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