Grade by availability on Stackage

[nponeccop]

In some areas it's not important whether a package is in any snapshots or not. But for libraries it's pretty much essential to be in snapshots for 2-3 recent GHC versions.

For example, for GUIs, gi-gtk is on Stackage, while wx isn't.

I think we should have a convention so that by default it's on Stackage. And if it's not we use a special icon/emoji/footnote/asterisk/whatever

[Gabriella439]

@nponeccop: Yeah, that seems fine to me

[sjakobi]

I believe there are quite a few high-quality libraries that are not on Stackage because the library maintainers are unwilling to cooperate with the Stackage maintainers or for other reasons.

So, if these packages are marked, I think it's important not to imply that they are of lesser quality than packages on Stackage.

[Gabriella439]

Maybe just add a "Stackage" label (and possibly a "Hackage" label for packages on Hackage but not Stackage) and let users infer what they want from those labels