add titles to aur and builds screens

add storage icon

frontend/lib/screens/aur_screen.dart

@@ -36,7 +36,9 @@ class _AurScreenState extends State<AurScreen> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: const Text("AUR"),
+      ),
       body: MultiProvider(
         providers: [
           ChangeNotifierProvider(create: (_) => PackagesProvider()),

frontend/lib/screens/builds_screen.dart

@@ -12,7 +12,9 @@ class BuildsScreen extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(
+        title: const Text("All Builds"),
+      ),
       body: MultiProvider(
         providers: [
           ChangeNotifierProvider<BuildsProvider>(