Change slack for discord (#1169)

tests/dummy/app/templates/public-pages/support-the-project.hbs

@@ -40,7 +40,7 @@
     <p>
       If you enjoy the addons this project provides and they help you in your daily work, you can support the development of the addons and it's
       documentation pages with a any contribution you feel appropiate by clicking on the button below but above all, by contributing,
-      opening issues and Pull Requests, answering questions in Slack or StackOverflow and above all, showing appreciation for everyone who works on
+      opening issues and Pull Requests, answering questions in <a target="_blank" href="https://discordapp.com/invite/zT3asNS">Discord</a> or StackOverflow and above all, showing appreciation for everyone who works on
       the Open Source Software we all use everyday.
     </p>