neovim: move from hosts/ to pkgs/

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

pkgs/default.nix

@@ -1,14 +1,8 @@
 { self, ... }: {
-  systems = [ "x86_64-linux" ];
-
   flake = {
     overlays = rec {
       packages = import ./packages.nix;
       default = packages;
     };
   };
-
-  perSystem = { pkgs, ... }: {
-    packages = self.overlays.default null pkgs;
-  };
 }