Add course Cycle.js Fundamentals (#6144)

* Update free-courses-en.md

* remove subcategory for cycle js

courses/free-courses-en.md

@@ -453,6 +453,7 @@
 
 * [Beginner's Series to: JavaScript](https://youtube.com/playlist?list=PLlrxD0HtieHhW0NCG7M536uHGOtJ95Ut2) - Microsoft Developer (YouTube)
 * [Bento JavaScript Learning Track](https://bento.io/topic/javascript) (Bento)
+* [Cycle.js Fundamentals](https://egghead.io/courses/cycle-js-fundamentals) - André Staltz
 * [Egghead.io](https://egghead.io)
 * [ES6 and Typescript Tutorial](https://www.youtube.com/playlist?list=PLC3y8-rFHvwhI0V5mE9Vu6Nm-nap8EcjV) - Codevolution, Vishwas Gopinath (YouTube)
 * [Functional Programming in Javascript](https://www.youtube.com/playlist?list=PL0zVEGEvSaeEd9hlmCXrk5yUyqUag-n84) - Mattias Petter Johansson «Fun Fun Function» (Youtube)