Expose `lib.ctp` to `config.lib.ctp` about nix

[getchoo]

most of my thoughts can be summed up here #96 (comment) and in a PR that implemented this already

as a tl;dr (and more specific to our library): exposing our lib to config wouldn't make much sense imo, as it's not an actual option. a proper way to do this would be a pure flake output or an importable version -- the latter of which we do have and can be used by others, but i understand it's not a nice way to do it

i don't think we should explicitly expose our lib in general though, as that would give us a much broader public api (and thus more pressure to keep it stable), and honestly? i'm not sure how useful most of our functions are. there are a few like you mentioned with mkUpper, but in general this isn't the case. i would also say it's a bit out of scope for this project to provide general utilities

[Weathercold]

Good point