use emojify.js with CDN

public/emoji_images

@@ -1 +0,0 @@
-../node_modules/emojify.js/dist/images

resource/js/util/PreProcessor/Emoji.js

@@ -3,8 +3,9 @@ import emojify from 'emojify.js';
 export default class Emoji {
 
   constructor() {
+    // see https://github.com/Ranks/emojify.js/issues/123
     emojify.setConfig({
-      img_dir: '/emoji_images/basic',
+      img_dir: 'https://github.global.ssl.fastly.net/images/icons/emoji/',
     });
   }