[DO NOT MERGE] Add connected accounts to A4AA Mintlify

[lrzhou25]

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Description

This PR contains the following updates:

• Removed references to client-initiated account linking
• Added content on Connected Accounts + purpose setting
• Updated prereqs to include setting up the My Account API

References

https://auth0team.atlassian.net/browse/AIDX-240?selectedIssue=DOCS-5200

Testing

Describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. If this library has unit and/or integration testing, tests should be added for new functionality and existing tests should complete without errors.

Please include any manual steps for testing end-to-end or functionality not covered by unit/integration tests.

Also include details of the environment this PR was developed in (language/platform/browser version).

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not the default branch