ci: ignore legacy

Author: kellyjosephprice

.eslintignore

@@ -1,4 +1,5 @@
 node_modules/
 coverage/
 dist/
+public/index.legacy.js
 __tests__/__fixtures__/**/sample.*

public/index.js

@@ -1,5 +1,4 @@
 import React from 'react';
-import ReactDOM from 'react-dom';
 import createRoot from 'react-dom/client';
 
 import syntaxHighlighter, { cmVariableContext } from '../src/index';