Improve 2FA Implementation and Documentation in Stack Auth API

[tanxeel]

Description:
The current 2FA implementation in the Stack Auth API is challenging to integrate due to its lack of clarity and usability. Currently, the feature is primarily exposed in the pre-built UI:
Account Settings Component

For a fully customizable 2FA integration, it seems necessary to rely on the endpoints, but the documentation provided is insufficient:
2FA Endpoint Documentation

Key issues:

• Limited documentation on implementing a custom 2FA workflow.
• No code examples or clear implementation guidelines for using the 2FA API endpoint.
• Switching to Stack Auth from other solutions like Clerk has been difficult due to the lack of support for customized 2FA.

Expected Behavior

• Comprehensive documentation with clear examples for integrating 2FA using API endpoints.
• Support for a fully customizable 2FA workflow independent of the pre-built UI.

Suggested Improvements:

• Enhance the 2FA API documentation with examples and use cases.
• Provide guidelines for implementing a customizable 2FA workflow.
• Expand the feature set beyond the pre-built UI to better support developers seeking flexibility.

Additional Information

This issue affects developers who require a tailored 2FA implementation for their applications. Addressing these concerns would significantly improve the adoption and usability of Stack Auth's API.

Thank you for your consideration!