Chore: Add support for new issue experience (fixes #3646)

Author: guywillis

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1 @@
+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/issue_template.md

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+---
+name: Issue template
+about: Create an issue to help us improve
+---
+
+### Subject of the issue/enhancement/features
+Describe your issue here.
+
+### Your environment
+* version (AT/Framework)
+* which browser and its version
+* device(s) + operating system(s)
+
+### Steps to reproduce
+Tell us how to reproduce this issue.
+
+### Expected behaviour
+Tell us what should happen
+
+### Actual behaviour
+Tell us what happens instead
+
+### Screenshots (if you can)