feat(courses): add golangr.com (#6695)

* courses: add Go course

* fix CI issues

* Update courses/free-courses-en.md

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

courses/free-courses-en.md

@@ -441,6 +441,7 @@
 * [Golang in under an hour](https://www.youtube.com/watch?v=N0fIANJkwic) - Eli Goldberg
 * [Golang Tutorial - Learn Go Programming Language](https://www.geeksforgeeks.org/golang-tutorial-learn-go-programming-language/) - GeeksforGeeks
 * [Gophercises: Free Coding Exercises for Budding Gophers](https://gophercises.com) - Jon Calhoun (email address *required*)
+* [Learn Go \| Learn Go Programming](https://golangr.com) - golangr.com
 * [Learn Go Programming - Golang Tutorial for Beginners](https://www.youtube.com/watch?v=YS4e4q9oBaU) - FreeCodeCamp
 * [Let's go with golang](https://www.youtube.com/playlist?list=PLRAV69dS1uWQGDQoBYMZWKjzuhCaOnBpa) - Hitesh Choudhary