feat: add otp and magic link example updates to the documentation

[iykazrji]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

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PR-Codex overview

This PR focuses on enhancing the user authentication process in a React Native application by introducing new methods for authenticating users via "Magic Link" and "One-Time Password (OTP)". It updates the sidebar navigation and adds corresponding documentation.

Detailed summary

• Deleted authenticating-users.mdx file.
• Updated signer authentication method to include emailMode options: "magicLink" and "otp".
• Added sidebar items for "Authenticating Users via Magic Link" and "One-Time Password (OTP)".
• Updated sidebar references in multiple files to reflect new authentication methods.
• Created two new documentation files: authenticating-with-magic-link.mdx and authenticating-with-otp.mdx with detailed usage examples.

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 20, 2024 6:20pm
aa-sdk-ui-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 20, 2024 6:20pm

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[iykazrji]

• feat: add otp and magic link example updates to the documentation #1247 👈 (View in Graphite)
• main

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