Add working APL book links and arrange in alphabetical order (#12905)

* Add working APL book links and arrange in alphabetical order

* Fix broken Bengali programming book links: Remove 404 link from C++ section, add new C book from Bangladesh Open University, add new C++ book from Shikkhok.com

* Modify programming book links in Bengali

undo changes to null as already changed in another pull request

* Remove APL book with bad SSL certificate as requested

Author: mekapilgupta

books/free-programming-books-bn.md

@@ -91,4 +91,3 @@
 ### Git and Github
 
 * [এক পলকে গিট ও গিটহাব](https://with.zonayed.me/book/git-n-github-at-glance/) - Zonayed
-

books/free-programming-books-langs.md

@@ -278,6 +278,7 @@ Books on general-purpose programming that don't focus on a specific language are
 
 ### APL
 
+* [A Programming Language](https://softwarepreservation.computerhistory.org/apl/book/APROGRAMMINGLANGUAGE.pdf) - Kenneth E. Iverson (PDF)
 * [APL2 at a glance](https://ia801009.us.archive.org/28/items/apl-2-at-a-glance-brown-pakin-polivka/APL2_at_a_Glance_-_Brown_Pakin_Polivka.pdf) - James A. Brown, Sandra Pakin, Raymond P. Polivka - 1988 (PDF)
 * [Introduction to College Mathematics with A Programming Language (1978)](https://softwarepreservation.computerhistory.org/apl/book/CollegeMathematicswithAPL.pdf) - E. J. LeCuyer (PDF)
 * [Learning APL](https://xpqz.github.io/learnapl) - Stefan Kruger (HTML,PDF,IPYNB)