Mention the new Discussions forum in the issue template

Author: nicoddemus

.github/ISSUE_TEMPLATE.md

@@ -4,7 +4,9 @@ Thanks for submitting an issue!
 Here's a quick checklist for what to provide:
 -->
 
-- [ ] a detailed description of the bug or suggestion
+- [ ] a detailed description of the bug or problem you are having
 - [ ] output of `pip list` from the virtual environment you are using
 - [ ] pytest and operating system versions
 - [ ] minimal example if possible
+
+If you have a question or an idea, consider posting a new topic to [Discussions](https://github.com/pytest-dev/pytest/discussions) instead.