ISSUE_TEMPLATE: revert one-sentence-per-line for package_request

We tried, but GitHub's markdown renderer will render these newlines
there, so going back to "real" paragraphs.

Also fixed the emphasis slightly, since "via Issues" is not bold, "via a
Pull Request" is also made not bold for consistency. Puts the focus more
on the "contribute" link as well.

Changed files
+2 -7
.github
ISSUE_TEMPLATE
+2 -7
.github/ISSUE_TEMPLATE/10_package_request.yml
···
</a>
</p>
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Thank you for your interest in packaging new software in Nixpkgs.
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Unfortunately, to mitigate the unsustainable growth of unmaintained packages, **Nixpkgs is no longer accepting package requests** via Issues.
+
Thank you for your interest in packaging new software in Nixpkgs. Unfortunately, to mitigate the unsustainable growth of unmaintained packages, **Nixpkgs is no longer accepting package requests** via Issues.
-
As a [volunteer community][community], we are always open to new contributors.
-
If you wish to see this package in Nixpkgs, **we encourage you to [contribute] it yourself, via a Pull Request**.
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Anyone can [become a package maintainer][maintainers]!
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You can find language-specific packaging information in the [Nixpkgs Manual][nixpkgs].
-
Should you need any help, please reach out to the community on [Matrix] or [Discourse].
+
As a [volunteer community][community], we are always open to new contributors. If you wish to see this package in Nixpkgs, **we encourage you to [contribute] it yourself**, via a Pull Request. Anyone can [become a package maintainer][maintainers]! You can find language-specific packaging information in the [Nixpkgs Manual][nixpkgs]. Should you need any help, please reach out to the community on [Matrix] or [Discourse].
[community]: https://nixos.org/community
[contribute]: https://github.com/NixOS/nixpkgs/blob/master/pkgs/README.md#quick-start-to-adding-a-package