Add RxJS course Asynchronous Programming: The End of The Loop (#6145)

* Add RxJS course "Asynchronous Programming: The End of The Loop"

* remove link to author's social

* remove egghead.io site link

Co-authored-by: Eric Hellman <eric@hellman.net>

courses/free-courses-en.md

@@ -451,10 +451,10 @@
 
 ### JavaScript
 
+* [Asynchronous Programming: The End of The Loop](https://egghead.io/courses/asynchronous-programming-the-end-of-the-loop) - Jafar Husain
 * [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)
 * [Intro to JavaScript ES6 programming](https://www.youtube.com/playlist?list=PL-xu4i_QDSxcoDNeh8rx5-pHCCTOg0XsI)