fix: add passkey responsive link

[RobChangCA]

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 updating the layout and visibility of elements in the Authentication.tsx component to improve responsiveness and user experience on larger screens.

Detailed summary

• Changed the div class to include lg:items-center for better alignment on large screens.
• Updated the <p> tag to be hidden on small screens and visible on large screens.
• Added a new <p> tag for the "Add passkey after sign up" message, visible only on small screens.
• Modified the className of the ExternalLinkIcon to be hidden on small screens and visible on large screens.

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