more/...tutorials: add Go-W3Schools (#5701)

* more/...tutorials: add Go-W3Schools

* fix CI

more/free-programming-interactive-tutorials-en.md

@@ -138,6 +138,7 @@
 ### Go
 
 * [Go Koans](https://github.com/cdarwin/go-koans)
+* [Go Tutorial](https://www.w3schools.com/go/) - W3Schools
 * [Start using Go](https://docs.microsoft.com/en-us/learn/paths/go-first-steps/) - Microsoft
 * [The Go Tutorial](http://tour.golang.org)