Update ABOUT.md (#207)

* Update ABOUT.md

adding an additional book, adding a link to the Discord community

* Update ABOUT.md

docs/ABOUT.md

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 # About
 
-"Racket (formerly named PLT Scheme) is a general purpose, multi-paradigm programming language in the Lisp/Scheme family. One of its design goals is to serve as a platform for language creation, design, and implementation. The language is used in a variety of contexts such as scripting, general-purpose programming, computer science education, and research." - [Wikipedia](https://en.wikipedia.org/wiki/Racket_(programming_language) "Wikipedia page on racket")
+"Racket (formerly named PLT Scheme) is a general purpose, multi-paradigm programming language in the Lisp/Scheme family. One of its design goals is to serve as a platform for language creation, design, and implementation. The language is used in a variety of contexts such as scripting, general-purpose programming, computer science education, and research." - [Wikipedia][wikipedia racket page]
 
-You can learn the basics of Racket through a coule of books.  Start by checking out [How to Design Programs](https://htdp.org "How to Design Programs website") or the slightly less formal but enjoyable [Realm of Racket](http://www.realmofracket.com/ "Realm of Racket website").
+You can learn the basics of Racket through a few different books.  Start by checking out [*How to Design Programs*][htdp], make your own games with the slightly less formal but enjoyable [*Realm of Racket*][realm], or explore Racket's diverse libraries with [*Racket Programming the Fun Way*][the fun way].
 
-The official language website can be found at <http://racket-lang.org/> and the source code is at <https://github.com/racket/racket/>.  You can find the community on [twitter](https://twitter.com/racketlang), [email](https://lists.racket-lang.org/) or [slack](https://racket.slack.com/).
+Check out the [official language website][racket homepage] and the [Github repository][racket github].  You can find the community on [Twitter][racket twitter], [mailing lists][racket listserv], [Discord][racket discord] and [Slack][racket slack].
 
 
+[wikipedia racket page]: https://en.wikipedia.org/wiki/Racket_(programming_language) "Wikipedia page on racket"
+[htdp]: https://htdp.org
+[realm]: http://www.realmofracket.com/
+[the fun way]: https://nostarch.com/racket-programming-fun-way
+[racket homepage]: http://racket-lang.org/
+[racket github]: https://github.com/racket/racket/
+[racket twitter]: https://twitter.com/racketlang
+[racket listserv]: https://lists.racket-lang.org/
+[racket discord]: https://discord.com/invite/6Zq8sH5
+[racket slack]: https://racket.slack.com/