move apps into pkgs and rename hosts

pkgs/tools/misc/rebuild/package.nix

@@ -0,0 +1,11 @@
+{ pkgs, ... }:
+
+pkgs.writeShellScriptBin "rebuild" ''
+  echo ${pkgs.system}
+  SYSTEM=${if pkgs.stdenv.isDarwin then "darwin" else "linux"}
+  if [ "$SYSTEM" == "darwin" ]; then
+      sudo darwin-rebuild switch --flake ${builtins.toString ../../../../.}
+  else
+      doas nixos-rebuild switch --flake ${builtins.toString ../../../../.}
+  fi
+''