Merge pull request #2875 from preactjs/JoviDeCroock-patch-1

(chore) - add discussions and a csb template

.github/ISSUE_TEMPLATE.md

@@ -4,7 +4,7 @@
 Here's a guide to getting your issue resolved quickly:
 
 ❓ Did you check that you're on the latest version of Preact?
-🗣 For help with Preact, ask on Slack: https://chat.preactjs.com/
+🗣 For help with Preact, ask on discussions: https://github.com/preactjs/preact/discussions
 ✨ Check for existing StackOverflow solutions: https://stackoverflow.com/search?q=preact
 📚 Check out our docs - for Preact 10: https://preactjs.com/guide/v10/getting-started
 🔎 Check if there's already an issue for your problem
@@ -20,6 +20,7 @@ If possible, please provide a CodeSandbox/Codepen that demonstrates the issue.
 Otherwise, we'll need the versions of Preact and related libraries you're using.
 For npm, copy & paste the output of this terminal command:
   npm ls --depth 0 | grep preact
+You can use the following template: https://codesandbox.io/s/preact-x-preact-cli-3-starter-vj285y2rn3
 -->
 
 ### Steps to reproduce