Add comparison chart to documentation covering similar projects

[alerque]

I don't know if I've only started noticing or if the tooling in this space has started to proliferate, but it isn't clear to me which tool to reach for an which project. Recently I've run across nixpacks, riff, and devbox, all of which seem to try and simplify building and-or using projects by abstracting some combination of nix and docker features. There are likely others I'm unaware of too. Of course this is in addition to lower level tooling like docker and nix shell and nix develop which can be used directly as well.

I think it would be useful for at least one of these projects to maintain a comparison chart that helps flesh out which projects cover which ground and what the respective pros and cons of each approach is to help people make informed choices about tooling.

c.f. same issue on nixpacks and riff.