docs: verify user on backend

[aashkrishnan]

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?
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PR-Codex overview

This PR adds a new FAQ section to the documentation, detailing two approaches for authenticating users and verifying user sessions on the backend after they log in with Account Kit.

Detailed summary

• Added a new section titled "How to Authenticate Users and Verify User Sessions on the Backend?"
• Introduced two options for user verification:
  • Option 1: stampWhoAmI + whoami for Smart Contract Accounts (SCAs)
  • Option 2: SIWE (Sign-In With Ethereum) for Externally Owned Accounts (EOAs)
• Explained the steps and benefits of each approach.

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