Replace the broken course for wordpress (#7385)

* Replace the broken course for wordpress

I replace the broken link for the course of WordPress in Spanish, so i added a new one fully available on Youtube

* Change the link of youtube to a Playlist

I change the title of the playlist to the correct one, and put on the channel of youtube about the course

courses/free-courses-es.md

@@ -274,7 +274,7 @@
 
 ### Sistemas de gestión de contenidos / CMS
 
-* [Aprende Wordpress de forma sencilla](https://miriadax.net/web/aprende-wordpress-de-forma-sencilla-2-edicion-)
+* [CURSO de WORDPRESS (Desde Cero) - 2020](https://www.youtube.com/playlist?list=PLs-v5LWbw7JnwF9RquAuuxLi-Ha1rths6) - Academia Coder (YouTube)
 
 
 ### Técnico de Software & Hardware