feat(flutter): on features page add link to integrations list (#10261)

* Update index.mdx

* Update docs/platforms/flutter/features/index.mdx

Co-authored-by: vivianyentran <[email protected]>

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Co-authored-by: Stephanie Anderson <[email protected]>
Co-authored-by: vivianyentran <[email protected]>

Author: 3 people

docs/platforms/flutter/features/index.mdx

@@ -20,5 +20,6 @@ Sentry's Flutter SDK enables automatic reporting of errors and exceptions, and i
     - by the [Flutter SDK](/platforms/flutter/enriching-events/breadcrumbs/#automatic-breadcrumbs).
     - via the Native SDKs [Automatic Breadcrumbs for Android](/platforms/android/enriching-events/breadcrumbs/#automatic-breadcrumbs) and [Automatic Breadcrumbs for iOS](/platforms/apple/usage/#sentryautobreadcrumbtrackingintegration).
     - as well as `http` with the [Dart SDK](/platforms/dart/).
+- Integrations for sqflite, routing and more. For a complete list, see our [integrations list](/platforms/flutter/integrations/).
 - [Release Health](/product/releases/health/) tracks crash free users and sessions.
 - Limited support for Flutter Web.