Added Next.js course from offical site--Hacktoberfest (#11423)

* Wordpress development course

* added the lint

* swap the line.

* wordpress development course

* Added Nextjs course

* updated the creator

Author: hn-agnihotri29

Diff for: courses/free-courses-en.md

@@ -1071,6 +1071,7 @@
 #### Next.js
 
 * [Complete Next.js Course For Beginners](https://www.youtube.com/playlist?list=PLynWqC6VC9KOvExUuzhTFsWaxnpP_97BD) - Daily Tuition
+* [Learn Next.js](https://nextjs.org/learn/dashboard-app) - Vercel (HTML)
 * [Master Next JS by Building Real Projects](https://www.youtube.com/playlist?list=PL6QREj8te1P7gixBDSU8JLvQndTEEX3c3) - JavaScript Mastery
 * [Mastering Next.js](https://masteringnextjs.com)
 * [Next.js 14 Beginner Roadmap & Course](https://www.youtube.com/playlist?list=PLrnPJCHvNZuBH7pax5p75JDNblo8rpl00) - Coding in Flow