propose a panel of default configs

[teto]

for instance:

• nvim-treesitter
• nvim-haskell-language-server
• nvim-telescope

so that people can try out configurations that are sure to work/reproducible/pure (and thus can compare their config to those). I've start sthg along these lines, it depends on PRs on nixpkgs.

[dwarfmaster]

While I think this is interesting and a good idea, I believe it may be better for it to be in another repository. Maybe something like https://github.com/nix-community/nix-environments, but for editors (which could also include runnable config for other editors eventually).

[Kranzes]

I don't think this belongs in this repo. This repo is only meant for providing an overlay and binary cache for nightly build.