This represents a major rearchitecture for nixvim, so I'm leaving this up to track the progress for now, and to serve as a reference for any breaking changes during transition.
The main change is, of course, being able to use nixvim standalone. To do this, you should use the new build function, which takes in two arguments: the system architecture (e.g. x86_64-linux) and the configuration. For the new configuration, do not use the programs.nixvim. prefix.
For module development, the main change is that you should no longer prefix your modules with programs.nixvim..
This fixes weird issues where you might get errors about libstdc++ after
updating your system without running :TSInstall again. Fixes it by just
relying on Nix to do the managing itself!
Unfortunately, for now this still needs work: you can't select which
languages are to be installed, which is why it's off by default. In the
hopefully not-too-distant future, this will be the default, and the
other way will be deprecated.
