Replaced dead link (#9180)

* Replaced dead link

* chore: add author name and university

* docs: deleted university name

* Update books/free-programming-books-it.md

* Update books/free-programming-books-it.md

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

books/free-programming-books-it.md

@@ -111,7 +111,7 @@
 
 ### <a id="cpp"></a>C++
 
-* [Corso C++ standard](http://didatticait.altervista.org/programmazione/CPP/CPP-dispense/CORSO_C.pdf) (PDF)
+* [Dispense del corso di Programmazione I con Laboratorio](https://www.dmi.unipg.it/~baioletti/didattica/materiale/dispense-progr1-c++.pdf) - Marco Baioletti (PDF)
 * [Il linguaggio C++](https://hpc-forge.cineca.it/files/CoursesDev/public/2012%20Autumn/Introduzione%20alla%20programmazioni%20a%20oggetti%20in%20C++/corsocpp.pdf) (PDF)