GitHub supports different types of issue templates for a while now.
The following types are supported:
* Bug report
(living in `.github/ISSUE_TEMPLATE/bug_report.md`),
* Feature request
(living in `.github/ISSUE_TEMPLATE/feature_request.md`), and
* Custom issue template
(living in `.github/ISSUE_TEMPLATE/custom.md`)
Our current issue template is mostly a bug report template, so this
moves it to `.github/ISSUE_TEMPLATE/bug_report.md`.
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