fix: remove outdated link in differences between esm and cjs

Fixes #34

Author: yangshun

questions/explain-the-differences-between-commonjs-modules-and-es-modules/en-US.mdx

@@ -94,7 +94,6 @@ While CommonJS was the default module system in Node.js initially, ES modules ar
 ## Further reading
 
 - [JavaScript modules - MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules)
-- [CommonJS vs ES Modules: the shift from require to import](https://nikolasbarwicki.com/articles/commonjs-vs-es-modules-the-shift-from-require-to-import/)
 - [Modules, introduction - javascript.info](https://javascript.info/modules-intro)
 - [Modules - Eloquent Javascript](https://eloquentjavascript.net/10_modules.html)
 - [CommonJS vs. ES modules in Node.js](https://blog.logrocket.com/commonjs-vs-es-modules-node-js/)