fix: Ran example and removed standard flutter tests

packages/flutter_introduction/example/lib/main.dart

@@ -57,8 +57,8 @@ class _MyHomePageState extends State<MyHomePage> {
             ],
             introductionTranslations: const IntroductionTranslations(
               skipButton: 'Skip it!',
-              nextButton: 'Previous',
+              nextButton: 'Next',
-              previousButton: 'Next',
+              previousButton: 'Previous',
               finishButton: 'To the app!',
             ),
             tapEnabled: true,

packages/flutter_introduction/example/test/widget_test.dart

@@ -1,33 +0,0 @@
-// SPDX-FileCopyrightText: 2022 Iconica
-//
-// SPDX-License-Identifier: BSD-3-Clause
-
-import 'package:example/main.dart';
-// This is a basic Flutter widget test.
-//
-// To perform an interaction with a widget in your test, use the WidgetTester
-// utility in the flutter_test package. For example, you can send tap and scroll
-// gestures. You can also use WidgetTester to find child widgets in the widget
-// tree, read text, and verify that the values of widget properties are correct.
-
-import 'package:flutter/material.dart';
-import 'package:flutter_test/flutter_test.dart';
-
-void main() {
-  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
-    // Build our app and trigger a frame.
-    await tester.pumpWidget(const MyApp());
-
-    // Verify that our counter starts at 0.
-    expect(find.text('0'), findsOneWidget);
-    expect(find.text('1'), findsNothing);
-
-    // Tap the '+' icon and trigger a frame.
-    await tester.tap(find.byIcon(Icons.add));
-    await tester.pump();
-
-    // Verify that our counter has incremented.
-    expect(find.text('0'), findsNothing);
-    expect(find.text('1'), findsOneWidget);
-  });
-}