Element seems to need to compile electron every single update and, on
macOS, runs another app called electron that is not of use to me.
Flatpak and Homebrew will work faster and be user friendly all around.
- Added nixpkgs-unstable input
- Added disko input
- Made nixosSystem & darwinSystem reusable with parameters
- Switched darwinConfigurations to use parameterized darwinSystem
- Switched nixosConfigurations to use parameterized darwinSystem