docs(web-dashboard): update content and links for introduction page

- Update description and wording in the introduction text
- Remove LinkButton import as it's not used
- Update URLs for "Read more" links to point to section overviews
- Update icon for Architecture card to "tree-structure"
- Update all "Read more" links to use consistent formatting

Author: fulleni

src/content/docs/web-dashboard/index.mdx

@@ -1,11 +1,11 @@
 ---
 title: 'Web Dashboard: Introduction'
-description: An overview of the Flutter News App Web Dashboard, the central control panel for your news ecosystem.
+description: An overview of the Flutter News App Web Dashboard, the central control panel for your news toolkit.
 ---
 
-import { Card, CardGrid, LinkButton } from '@astrojs/starlight/components';
+import { Card, CardGrid } from '@astrojs/starlight/components';
 
-The Flutter News App Web Dashboard is a comprehensive, production-ready web application built with Flutter. It serves as the central control panel for your entire news ecosystem, providing administrators and content publishers with the tools they need to manage content, configure the mobile app's behavior, and monitor key statistics.
+The Web Dashboard is a comprehensive, production-ready web application built with Flutter. It serves as the central control panel for your entire news toolkit, providing administrators and content publishers with the tools they need to manage content, configure the mobile app's behavior, and monitor key statistics.
 
 <CardGrid>
 	<Card title="Local Setup" icon="rocket">
@@ -18,18 +18,18 @@ The Flutter News App Web Dashboard is a comprehensive, production-ready web appl
 	</Card>
 	<Card title="Features" icon="puzzle">
 		Explore the key features, from content management to remote app configuration.
-		[Read more &rarr;](/docs/web-dashboard/features/dashboard-overview/)
+		[Read more &rarr;](/docs/web-dashboard/features/)
 	</Card>
-	<Card title="Architecture" icon="structure">
+	<Card title="Architecture" icon="tree-structure">
 		Understand the architecture, state management, and navigation patterns.
-		[Read more &rarr;](/docs/web-dashboard/architecture/overview/)
+		[Read more &rarr;](/docs/web-dashboard/architecture/)
 	</Card>
 	<Card title="Developer Guides" icon="document">
 		Practical guides for developers on theming, customization, and localization.
-		[Read more &rarr;](/docs/web-dashboard/guides/theming-and-customization/)
+		[Read more &rarr;](/docs/web-dashboard/guides/)
 	</Card>
   <Card title="User Manuals" icon="open-book">
 		User-focused manuals for administrators and publishers.
-		[Read more &rarr;](/docs/web-dashboard/manuals/managing-content/)
+		[Read more &rarr;](/docs/web-dashboard/manuals/)
 	</Card>
 </CardGrid>