ISSUE_TEMPLATES: remove the package request template

[SigmaSquadron]

As discussed in the Nixpkgs Contributions Matrix room, several contributors have reached a consensus that such a template only encourages future orphaned packages, and needlessly adds work for actual Nixpkgs contributors while demanding nothing from the issue reporter.

Things done

• This change does not require rebuilds or a changelog entry.
• Fits CONTRIBUTING.md.

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Add a 👍 reaction to pull requests you find important.

[emilazy]

Yes, I think the incentives are bad here: it encourages people to add packages they don’t necessarily care about or don’t have the necessary domain knowledge to ensure are working over time. The result will often be broken packages or ones that get abandoned. As there is always going to be more and more software that Nixpkgs hasn’t packaged and achieving consensus that a piece of software is not worth packaging is hard, the number of these issues will basically inevitably grow forever.

I don’t think there’s never an instance where it makes sense to open an issue for software Nixpkgs is missing – e.g. “we don’t package this piece of software that is required for this common piece of hardware to work properly on NixOS” is a reasonable bug report – but we don’t need an entire form template to encourage it, and the Discourse is often going to be a better place for these requests.

I’ll leave time for others to comment, though.