Add blocklist to prevent tailwind from generating incorrect css (#2274)

Author: paoloredis

tailwind.config.js

@@ -3,6 +3,7 @@ const plugin = require('tailwindcss/plugin');
 
 module.exports = {
   content: ["content/**/*.md", "layouts/**/*.html", "./tailwindcss.whitelist.txt"],
+  blocklist: ['[username:password@]'],
   theme: {
     extend: {
       fontFamily: {