Revert image support added on web

lib/widgets/editor.dart

@@ -1,7 +1,5 @@
-import 'dart:html' as html;
 import 'dart:io';
 import 'dart:math' as math;
-import 'dart:ui' as ui;
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
@@ -80,19 +78,7 @@ Widget _defaultEmbedBuilder(BuildContext context, leaf.Embed node) {
   switch (node.value.type) {
     case 'image':
       if (kIsWeb) {
-        String imageUrl = node.value.data;
+        return SizedBox.shrink();
-
-        ui.platformViewRegistry.registerViewFactory(
-          imageUrl,
-          (int viewId) => html.ImageElement()..src = imageUrl,
-        );
-        return Container(
-          constraints: BoxConstraints(maxWidth: 300),
-          height: MediaQuery.of(context).size.height,
-          child: HtmlElementView(
-            viewType: imageUrl,
-          ),
-        );
       }
       String imageUrl = node.value.data;
       return imageUrl.startsWith('http')