refactor: Update "Additional Resources" section UI and content

This commit refactors the "Additional Resources" section on the home screen.

The background color has been updated to `Colors.white` in light mode and `Colors.gray[800]` in dark mode for better visual consistency.

The heading has been changed from "Technologie Stack" to "Weitere Ressourcen" (Additional Resources), and the subheading has been updated to "Dokumentation und Hilfestellung für Entwickler" (Documentation and help for developers) to more accurately reflect the section's purpose.

Author: Lukas Gundermann

lib/screens/home/widgets/additional_resources.dart

@@ -38,18 +38,18 @@ class AdditionalResources extends StatelessWidget {
     final isDarkMode = context.watch<ThemeCubit>().state.isDarkMode;
     return Container(
       width: double.infinity,
-      color: isDarkMode ? Colors.gray[950] : Colors.gray[50],
+      color: isDarkMode ? Colors.gray[800] : Colors.white,
       child: Column(
         children: [
-          Text('Technologie Stack').bold.responsive(
+          Text('Weitere Ressourcen').bold.responsive(
             context,
             mobile: (t) => t.x3Large,
             tablet: (t) => t.x3Large,
             desktop: (t) => t.x4Large,
           ),
           Gap(16),
           Text(
-            'Moderne und bewährte Technologien für beste Performance',
+            'Dokumentation und Hilfestellung für Entwickler',
           ).setColors(
             lightColor: Colors.gray[600],
             darkColor: Colors.gray[400],