User registration and types

[rosieyohannan]

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Description

• Created a new documentation page: user-types-and-registration.adoc in the plans-pricing section.
• This page defines Registered, Active, and Unregistered users, provides instructions on how to register, and offers guidance for organization administrators.
• Updated nav.adoc to include the new page.
• Added cross-references to the new page from prevent-unregistered-users-from-spending-credits.adoc, billing-faq-snip.adoc, plan-free.adoc, and plan-performance.adoc.

Reasons

This PR resolves Linear issue DOC-23 by:

• Providing clear documentation on how to register within CircleCI.
• Defining the terms "Registered User," "Active User," and "Unregistered User."
• Addressing urgent customer concerns and the upcoming billing changes for unregistered users (effective December 1st) by explaining their implications and providing solutions.
• Empowering users to become registered and active, and guiding admins on managing user types.

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Linear Issue: DOC-23

  

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[linear]

DOC-23 Registered User in CircleCI