Spanish branch (spanish-speaker reviews requested!) (#2635)

* Add list of courses in Spanish.

* Update readme to add list of courses in Spanish.

* Correct titles in the list.

* Update free-programming-books-es.

Update, add and clean links. add books, add authors and correct types of
documents. Delete paid links or broken.

* Correct cli errors.

* Correct Cli Errors - 2

* Fix alphabetical ordering.

* Fix alphabetical order and a some link and angle bracket.

free-courses-es.md: Correction of links and anchors.
free-programming-books-es.md: Alphabetical ordering.

* Fix 2635#pullrequestreview-76815495

@eshellman If I finish with updating the documents in Spanish  #2635
before Black Friday.
You could give me a new pc for me work?   👅 Of Christmas
🎁...  🤐 🤐       Ok, joke..
sorry.

I m going to work 💪  ☺️ I need to do it, to feel satisfied
with myself 😎

README.md

@@ -54,7 +54,7 @@ Please read [CONTRIBUTING](/CONTRIBUTING.md).
 + [English](/free-courses-en.md)
 + [German](/free-courses-de.md)
 + [Russian](/free-courses-ru.md)
-
++ [Spanish](/free-courses-es.md)
 
 ### Interactive Programming Resources
 + [Free interactive programming tutorials](/free-programming-interactive-tutorials-en.md)