Implemented custom navigation bar

lib/main.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
-import 'package:game_tracker/presentation/views/home_view.dart';
+import 'package:game_tracker/core/custom_theme.dart';
+import 'package:game_tracker/presentation/views/main_menu/custom_navigation_bar.dart';
 
 void main() {
   runApp(const MyApp());
@@ -11,11 +12,12 @@ class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
+      debugShowCheckedModeBanner: false,
       title: 'Game Tracker',
-      theme: ThemeData(
-        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
-      ),
-      home: const HomeView(),
+      themeMode: ThemeMode.dark,
+      darkTheme: ThemeData.dark(),
+      theme: ThemeData(appBarTheme: CustomTheme.appBarTheme),
+      home: const CustomNavigationBar(),
     );
   }
 }