Update issue templates

.github/ISSUE_TEMPLATE/custom.md

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+---
+name: Custom issue template
+about: Report a bug
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Important Notice:
+This repository no longer uses "Issues" to track bugs. Please report all bugs, feature requests, etc.. in "Discussions": https://github.com/alpinejs/alpine/discussions/categories/bugs
+
+All issues opened will be abruptly closed. Thank you!