`nix-info -m` outputs Markdown, so it makes more sense to include it in
issues verbatim than within a preformatted code block.
Co-authored-by: Gavin John <gavinnjohn@gmail.com>
Create new categories for the issues:
* Bug report
* Packaging request
* Security
Add metadata information to the issues so that we may match issues to
maintainers using a bot in the future.
The old `.github/ISSUE_TEMPLATE.md` is being used by the "Open a regular
issue." link.
The goal is to get all the necessary information from the reporter upfront.
Too many times the issues submits and we need to do a round of asking before
we can get close to a solution.
