RESOURCES.md - reference-style links (#174)

Author: keiravillekode

docs/RESOURCES.md

@@ -1,14 +1,30 @@
 # Recommended learning resources
 
-* The [Official Factor Documentation](http://docs.factorcode.org).
-* The [Factor GitHub Repository Wiki](http://github.com/factor/factor/wiki).
-* [Björn Lindqvist's Factor Playground](http://github.com/bjourne/playground-factor).
-* [Learn X in Y Minutes, where X = Factor](http://learnxinyminutes.com/docs/factor).
-* [Factor on RosettaCode](http://rosettacode.org/wiki/Category:Factor).
-* The [Concatenative.org Factor Wiki](concatenative.org/wiki/view/Factor).
-* The [`factor-lang` tag on Stack Overflow](http://stackoverflow.com/questions/tagged/factor-lang).
-* The [Factor Mailing List](http://concatenative.org/wiki/view/Factor/Mailing%20list).
-* The [Factor IRC Channel](http://concatenative.org/wiki/view/Concatenative%20IRC%20channel).
-* The [Joy](http://enwp.org/Joy_%28programming_language%29) and [Forth](http://enwp.org/Forth_%28programming_language%29) programming languages.
-* The [Common Lisp Object System](http://enwp.org/Common_Lisp_Object_System).
-* [Factor itself](http://github.com/factor/factor).
+* The [Official Factor Documentation][official-docs].
+* The [Factor GitHub Repository Wiki][github-wiki].
+* [Björn Lindqvist's Factor Playground][playground-factor].
+* [Learn X in Y Minutes, where X = Factor][learn-x-in-y-minutes].
+* [Factor on RosettaCode][rosetta-code].
+* The [Concatenative.org Factor Wiki][concatenative-wiki].
+* The [`factor-lang` tag on Stack Overflow][stack-overflow].
+* The [Factor Mailing List][mailing-list].
+* The [Factor IRC Channel][irc-channel].
+* The [Joy][joy] and [Forth][forth] programming languages.
+* The [Common Lisp Object System][clos].
+* [Factor itself][factor-repo].
+* [Factor Discord][discord].
+
+[official-docs]: https://docs.factorcode.org/
+[github-wiki]: https://github.com/factor/factor/wiki
+[playground-factor]: https://github.com/bjourne/playground-factor
+[learn-x-in-y-minutes]: https://learnxinyminutes.com/docs/factor
+[rosetta-code]: https://rosettacode.org/wiki/Category:Factor
+[concatenative-wiki]: https://concatenative.org/wiki/view/Factor
+[stack-overflow]: https://stackoverflow.com/questions/tagged/factor-lang
+[mailing-list]: https://concatenative.org/wiki/view/Factor/Mailing%20list
+[irc-channel]: https://concatenative.org/wiki/view/Concatenative%20IRC%20channel
+[joy]: https://enwp.org/Joy_%28programming_language%29
+[forth]: https://enwp.org/Forth_%28programming_language%29
+[clos]: https://enwp.org/Common_Lisp_Object_System
+[factor-repo]: https://github.com/factor/factor
+[discord]: https://discord.gg/QxJYZx3QDf