remove apiv1errorhandler js and unnesessary codemirror in codemirroreditor

packages/app/src/client/util/apiv1ErrorHandler.js

@@ -1,13 +0,0 @@
-class Apiv1ErrorHandler extends Error {
-
-  constructor(message = '', code = '', data = '') {
-    super();
-
-    this.message = message;
-    this.code = code;
-    this.data = data;
-  }
-
-}
-
-module.exports = Apiv1ErrorHandler;

packages/app/src/components/PageEditor/CodeMirrorEditor.jsx

@@ -5,7 +5,6 @@ import urljoin from 'url-join';
 import * as codemirror from 'codemirror';
 
 import { Button } from 'reactstrap';
-import { UnControlled as ReactCodeMirror } from 'react-codemirror2';
 
 import { JSHINT } from 'jshint';