feat: Update app title to HushNet and modify home page title accordingly

Author: AdamLBS

lib/main.dart

@@ -16,9 +16,9 @@ class HushNetApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
-      title: 'Flutter Demo',
+      title: 'HushNet',
       theme: hushNetTheme,
-      home: const MyHomePage(title: 'Flutter Demo Home Page'),
+      home: const MyHomePage(title: 'HushNet Home Page'),
     );
   }
 }