Added a free course of Bootstrap by Scrimba (#11558)

* Added a free Interactive Bootstrap tutorial by Scrimba

* Update free-programming-interactive-tutorials-en.md

* Update free-courses-en.md

courses/free-courses-en.md

@@ -894,6 +894,7 @@
 * [Complete Bootstrap Crash Course \| Bootstrap 4 Tutorial](https://www.youtube.com/watch?v=ZfRn9VJzdGA) - Julio Codes
 * [Gentle Introduction to Bootstrap 5 for Beginners](https://www.youtube.com/playlist?list=PLErOmyzRKOCr47pRGOswKcgzGyetNRdHZ) - Deborah Kurata
 * [Introduction to Bootstrap - A Tutorial](https://www.classcentral.com/course/edx-introduction-to-bootstrap-a-tutorial-3338) - Microsoft via edX (Class Central)
+* [Learn Bootstrap](https://v2.scrimba.com/learn-bootstrap-c0o) - Scrimba 
 * [Learn Bootstrap 4 for free](https://scrimba.com/learn/bootstrap4) - Neil Rowe (Scrimba)
 * [Learn Bootstrap 4 in this free 10-part course](https://www.freecodecamp.org/news/want-to-learn-bootstrap-4-heres-our-free-10-part-course-happy-easter-35c004dc45a4/) - Per Harald Borgen (Freecodecamp)
 * [Learn Bootstrap 5 and SASS by Building a Portfolio Website - Full Course](https://www.youtube.com/watch?v=iJKCj8uAHz8) - Patrick Muriungi, freeCodeCamp