removed mkbackup script, refactored all script files to use pkgs.writeShellApplication rather than pkgs.writeShellScriptBin

modules/home/scripts/nix/nsp.nix

@@ -1,9 +1,11 @@
 {
-  self,
-  pkgs,
+  pkgs
 }:
-pkgs.writeShellScriptBin "nsp" ''
-  #!/run/current-system/sw/bin/bash
+pkgs.writeShellApplication {
+  name = "nsp";
+  text = ''
+    #!/run/current-system/sw/bin/bash
 
-  nix-shell -p "$@" --run zsh
-''
+    nix-shell -p "$@" --run zsh
+  '';
+}