fix: alphabetize sections (#5523)

Swap HTML-GO

books/free-programming-books-it.md

@@ -140,6 +140,12 @@
 * [Guida linguaggio SQL](http://www.html.it/guide/guida-linguaggio-sql/?cref=system) (HTML)
 
 
+### Golang
+
+* [Golang](http://www.vittal.it/wp-content/uploads/2019/01/golang.pdf) - V.Albertoni (PDF)
+* [The Little Go Book](https://github.com/francescomalatesta/the-little-go-book-ita) - Karl Seguin, Francesco Malatesta ([HTML](https://github.com/francescomalatesta/the-little-go-book-ita/blob/master/it/go.md))
+
+
 ### HTML
 
 * [Canoro sito](http://canoro.altervista.org/guide/html/GuidaHTML22.pdf) (PDF)
@@ -147,12 +153,6 @@
 * [INFN di Milano](http://www.mi.infn.it/~calcolo/corso_base_html/pdf/corso_base_html.pdf) (PDF)
 
 
-### Golang
-
-* [Golang](http://www.vittal.it/wp-content/uploads/2019/01/golang.pdf) - V.Albertoni (PDF)
-* [The Little Go Book](https://github.com/francescomalatesta/the-little-go-book-ita) - Karl Seguin, Francesco Malatesta ([HTML](https://github.com/francescomalatesta/the-little-go-book-ita/blob/master/it/go.md))
-
-
 ### Java
 
 * [Appendici del manuale di Java 9](https://www.hoepli.it/editore/hoepli_file/download_pub/978-88-203-8302-2_Java9-Appendici.pdf) - C. De Sio Cesari (PDF)