Added book: Functional-Light Javascript (#7795)

* Added book: Functional-Light Javascript

* Changed order to make alphabetical

* Added indications

* remove the subject listing

Co-authored-by: Harshit Vishnoi <5825564-HARDY8118@users.noreply.gitlab.com>
Co-authored-by: Eric Hellman <eric@hellman.net>

books/free-programming-books-langs.md

@@ -1107,6 +1107,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [Eloquent JavaScript 3rd edition](http://eloquentjavascript.net) - Marijn Haverbeke (HTML, PDF, EPUB, MOBI)
 * [Essential Javascript](https://www.programming-books.io/essential/javascript/) - Krzysztof Kowalczyk, StackOverflow Contributors
 * [Exploring ES6](http://exploringjs.com/es6/) - Dr. Axel Rauschmayer (HTML)
+* [Functional-Light JavaScript](https://github.com/getify/Functional-Light-JS) - Kyle Simpson (HTML)
 * [Google JavaScript Style Guide](https://google.github.io/styleguide/javascriptguide.xml) - Aaron Whyte, Bob Jervis, Dan Pupius, Erik Arvidsson, Fritz Schneider, Robby Walker (HTML)
 * [Human JavaScript](http://read.humanjavascript.com/ch01-introduction.html) - Henrik Joreteg (HTML)
 * [JavaScript (ES2015+) Enlightenment](https://frontendmasters.com/guides/javascript-enlightenment/) - Cody Lindley (HTML)