new nixos dotfile layout

Signed-off-by: Michał Czyż <mike@c2yz.com>

overlays/default.nix

@@ -1,41 +0,0 @@
-# This file defines overlays
-{inputs, ...}: {
-  # This one brings our custom packages from the 'pkgs' directory
-  additions = final: _prev:
-    import ../pkgs {pkgs = final;};
-
-  # This one contains whatever you want to overlay
-  # You can change versions, add patches, set compilation flags, anything really.
-  # https://nixos.wiki/wiki/Overlays
-  modifications = final: prev: {
-    # example = prev.example.overrideAttrs (oldAttrs: rec {
-    # ...
-    # });
-  };
-
-  # For every flake input, aliases 'pkgs.inputs.${flake}' to
-  # 'inputs.${flake}.packages.${pkgs.system}' or
-  # 'inputs.${flake}.legacyPackages.${pkgs.system}'
-  flake-inputs = final: _: {
-    inputs =
-      builtins.mapAttrs (
-        _: flake: let
-          legacyPackages = (flake.legacyPackages or {}).${final.system} or {};
-          packages = (flake.packages or {}).${final.system} or {};
-        in
-          if legacyPackages != {}
-          then legacyPackages
-          else packages
-      )
-      inputs;
-  };
-
-  # When applied, the unstable nixpkgs set (declared in the flake inputs) will
-  # be accessible through 'pkgs.unstable'
-  unstable-packages = final: _prev: {
-    unstable = import inputs.nixpkgs-unstable {
-      system = final.system;
-      config.allowUnfree = true;
-    };
-  };
-}