Editing and maintenance of the Angular framework sources. (#10307)

* Update free-programming-books-es.md

Como aprender Angular? / How to learn Angular? The link redirects to a non-related website.

* Angular.js sections merged into only one section.

After reviewing the two sections we had, I decided that having all the Angular.js information merged into one section would make it easier for the readers to access the information.

* Angular.js sections merged into only one section ( Alphabetical order corrected) .

After reviewing the two sections we had, I decided that having all the Angular.js information merged into one section would make it easier for the readers to access the information.

* Due to the book versions for the Angular Framework that we currently have, a section for version 1x and for version 2x was created.

Based on the points to review the following changes have been made to free-programming-books-es.md in the Angular section.

https://github.com/EbookFoundation/free-programming-books/issues/4940 - Because the topic of versions had already been addressed, two separate sections mentioning the Angular  Framework versions were created to facilitate the readers' easier access to the information.

https://github.com/EbookFoundation/free-programming-books/pull/10086/files#r1353445655 - The link was removed since the book was not free to access

https://github.com/EbookFoundation/free-programming-books/pull/10086/files#r1353446027 - The link was removed because it was a tutorial blog.

https://github.com/EbookFoundation/free-programming-books/pull/10086/files#r1353442067 - Only left the main link to access the book.

* Editing and maintenance of Angular Framework sources; some sources were not free or were books.

These changes are related to the following thread: https://github.com/EbookFoundation/free-programming-books/pull/10086#issuecomment-1758611665

books/free-programming-books-es.md

@@ -413,8 +413,6 @@
 
 > :information_source: Véase también … [AngularJS](#angularjs)
 
-* [Angular 2](https://rldona.gitbooks.io/angular-2-book) - Raúl López (HTML)
-* [Aprendiendo Angular](https://ngchallenges.gitbook.io) - Vanessa Aristizabal (HTML)
 * [Aprendizaje Angular](https://riptutorial.com/Download/angular-es.pdf) - Compiled from StackOverflow Documentation (PDF)
 * [Aprendizaje Angular 2](https://riptutorial.com/Download/angular-2-es.pdf) - Compiled from StackOverflow Documentation (PDF)
-* [Entendiendo Angular](https://jorgeucano.gitbook.io/entendiendo-angular/) - Jorge Cano (HTML, [:package: ejemplos](https://github.com/jorgeucano/entendiendo-angular))
+* [Entendiendo Angular](https://jorgeucano.gitbook.io/entendiendo-angular/) - Jorge Cano