docs: flutter

[MarkOSullivan94]

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This pull request introduces documentation for integrating Clerk authentication into Flutter applications using the clerk_flutter package.

Flutter Quickstart and Social Sign-In Integration:

• Added a new Flutter Quickstart guide that walks users through setting up Clerk authentication in a Flutter app, including installation, Android configuration, and usage of prebuilt Clerk widgets.
• Introduced detailed guides for implementing native "Sign in with Apple" and "Sign in with Google" in Flutter, covering both prebuilt UI and custom authentication flows, platform-specific requirements, and troubleshooting tips. [1] [2]
• Updated the getting started overview to include Flutter as a supported SDK, with navigation and icon support.

Clerk Widget Theming for Flutter:

• Added a new reference page for ClerkThemeExtension, explaining how to customize Clerk widget colors and text styles using Flutter's theming system, with code samples for global and scoped theming, custom text styles, and light/dark mode support.

Deadline

• No rush

Other resources

- https://pub.dev/packages/clerk_flutter
- https://pub.dev/packages/clerk_auth

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