docs: remove introduction page content

- Deleted the entire introduction page content for the Flutter News App Toolkit
- This includes the hero section, card grid, and additional information
- The page is likely being replaced or significantly revamped

Author: fulleni

src/content/docs/welcome/introduction.mdx

@@ -1,60 +0,0 @@
----
-title: 'Introduction: The Flutter News App Toolkit'
-description: A complete, production-ready toolkit for building a cross-platform news application.
-template: splash
-hero:
-  tagline: Your full-stack solution for launching a professional news platform. Includes a Flutter mobile app, a web-based dashboard, and a powerful Dart Frog backend.
-  image:
-    file: ../../../assets/houston.webp
-  actions:
-    - text: Start Local Setup
-      link: /getting-started/local-setup/
-      icon: right-arrow
-    - text: View on GitHub
-      link: https://github.com/flutter-news-app-full-source-code
-      icon: external
-      variant: minimal
----
-
-import { Card, CardGrid, LinkButton } from '@astrojs/starlight/components';
-
-## A Complete, Production-Ready Ecosystem
-
-Welcome to the Flutter News App Full Source Code Toolkit. This is more than just an app template; it's a complete, three-part ecosystem designed to work seamlessly together, giving you everything you need to launch, manage, and scale a modern news application.
-
-<CardGrid>
-  <Card title="Mobile Client App" icon="phone">
-    A feature-rich Flutter application for iOS and Android that delivers a beautiful, intuitive news reading experience to your users.
-    <br /><br />
-    <LinkButton href="https://flutter-news-app-full-source-code.github.io/flutter-news-app-mobile-client-full-source-code/" target="_blank">View Live Demo</LinkButton>
-    <a href="https://github.com/flutter-news-app-full-source-code/flutter-news-app-mobile-client-full-source-code" target="_blank" style={{ marginLeft: '1rem', fontSize: '0.875rem' }}>Browse on GitHub</a>
-  </Card>
-  <Card title="Web Dashboard" icon="laptop">
-    A comprehensive Flutter web app for administrators and publishers to manage content, configure app settings, and view key analytics.
-    <br /><br />
-    <LinkButton href="https://flutter-news-app-full-source-code.github.io/flutter-news-app-web-dashboard-full-source-code/" target="_blank">View Live Demo</LinkButton>
-    <a href="https://github.com/flutter-news-app-full-source-code/flutter-news-app-web-dashboard-full-source-code" target="_blank" style={{ marginLeft: '1rem', fontSize: '0.875rem' }}>Browse on GitHub</a>
-  </Card>
-  <Card title="API Server" icon="cloud">
-    A high-performance backend built with Dart Frog, providing robust APIs for authentication, data management, and remote configuration.
-    <br /><br />
-    <a href="https://github.com/flutter-news-app-full-source-code/flutter-news-app-api-server-full-source-code" target="_blank" style={{ fontSize: '0.875rem' }}>Browse on GitHub</a>
-  </Card>
-</CardGrid>
-
-### Built for Quality and Maintainability
-
-This toolkit is built on a foundation of clean architecture and modern best practices. By separating concerns into a layered backend, a powerful admin dashboard, and a user-facing mobile client, you get a system that is robust, scalable, and easy to maintain.
-
-### Next Steps
-
-Ready to get started? Our local setup guides will walk you through running the entire ecosystem on your machine.
-
-<div style={{ display: 'flex', gap: '1rem', marginTop: '1.5rem' }}>
-  <LinkButton href="/getting-started/local-setup">
-    Begin Local Setup
-  </LinkButton>
-  <LinkButton href="/deployment/api-server" variant="secondary">
-    See Deployment Guides
-  </LinkButton>
-</div>