feat: add keyboard shortcuts for notes, the note list and the app

lib/read_only.dart

@@ -7,12 +7,10 @@ import 'themes/night.dart';
 class ReadOnlyPage extends StatelessWidget {
   final String title;
   final String content;
-  final bool isDarkMode;
 
   ReadOnlyPage({
     required this.title,
     required this.content,
-    required this.isDarkMode,
   });
 
   @override
@@ -20,7 +18,9 @@ class ReadOnlyPage extends StatelessWidget {
     final view = MarkdownView(
       controller: MarkdownController(
         text: content,
-        theme: isDarkMode ? nightTheme : dayTheme,
+        theme: Theme.of(context).brightness == Brightness.dark
+            ? nightTheme
+            : dayTheme,
       ),
     );