feat: export JSON in mobile and update mobile_example.json (#515)

* feat: add export json in mobile

* chore: update editor style and example json for mobile showcase

* chore: improve text content

example/lib/pages/mobile_editor.dart

@@ -107,14 +107,16 @@ class _MobileEditorState extends State<MobileEditor> {
   // showcase 1: customize the editor style.
   EditorStyle _buildMobileEditorStyle() {
     return EditorStyle.mobile(
-      cursorColor: Colors.blue,
-      selectionColor: Colors.blue.shade200,
+      cursorColor: const Color.fromARGB(255, 134, 46, 247),
+      selectionColor: const Color.fromARGB(50, 134, 46, 247),
       textStyleConfiguration: TextStyleConfiguration(
         text: GoogleFonts.poppins(
           fontSize: 14,
           color: Colors.black,
         ),
-        code: GoogleFonts.badScript(),
+        code: GoogleFonts.sourceCodePro(
+          backgroundColor: Colors.grey.shade200,
+        ),
       ),
       padding: const EdgeInsets.symmetric(horizontal: 24.0),
     );