feat: discord auth

[jcaleb4]

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?

NOTE: This is WIP, we need to verify that this is working with account kit config.

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PR-Codex overview

This PR introduces support for the discord authentication provider across various components, including updates to OAuth methods, UI elements, and icon imports. It enhances the user interface by integrating the DiscordIcon and modifying related functionality.

Detailed summary

• Added discord to OAuth scopes in oauth.ts.
• Updated KnownAuthProvider to include discord in signer.ts.
• Modified oAuthMethods to include discord in config.tsx.
• Integrated DiscordIcon in various components.
• Added Discord button in the OAuth section.
• Implemented toggle functionality for discord authentication in Authentication.tsx.
• Created discord.svg and DiscordIcon components.
• Updated OAuth connection handling to include discord in oauth.tsx.

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