Simple navigation menu

lib/page/actions_page.dart

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+import 'package:flutter/material.dart';
+
+
+class ActionPage extends StatelessWidget {
+  const ActionPage({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Text('B'),
+    );
+  }
+}

lib/page/repos_page.dart

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+import 'package:flutter/material.dart';
+
+
+class ReposPage extends StatelessWidget {
+  const ReposPage({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Text('A'),
+    );
+  }
+}