Add APL-related items (#6652)

* Add one APL book

And fix links and notes the some others

* Add APL cheat sheets

* APL courses

* French APL video series

* mark APL Course as in process, add one more course

* mark as in process

* ADSP and Array Cast

* Add APL

* Add APL-related entries

* Add number for sort ordering

* correct number of blank lines between last section and next heading

* Remove trailing slash

* Move book

* Move book and limit URLs to 1 per line

* full URL

* add missing line

* Combine into playlist

* replace multiple links with single link

… which is a redirect to the listing for the latest released version

casts/free-podcasts-screencasts-en.md

@@ -239,6 +239,8 @@
 ### Language Agnostic
 
 * [/dev/hell](http://devhell.info) (podcast)
+* [ADSP: The Podcast](https://adspthepodcast.com) (podcast)
+* [Array Cast](https://arraycast.com) (podcast)
 * [Arrested DevOps](https://www.arresteddevops.com) (podcast)
 * [baseCS](https://www.codenewbie.org/basecs) (podcast based on [a series of posts on medium](https://medium.com/basecs))
 * [Between \| Screens Podcast](https://soundcloud.com/between-screens) (podcast)