chore: changed requirements for nix/nixos

I changed it to only required if your using @tauri-apps/cli in package.json 
I added cargo-tauri commented out if people want to use it

src/content/docs/start/prerequisites.mdx

@@ -192,13 +192,14 @@ mkShell {
     libiconv
   ] ++ lib.optionals stdenv.isLinux [ gtk3 libsoup_3 webkitgtk_4_1] ++
 	lib.optionals stdenv.isDarwin [
-		# Required deps for mac
+		# Only required if your using the npm package `@tauri-apps/cli` inside of your `package.json`
 		darwin.libobjc
 		darwin.apple_sdk.frameworks.AppKit
 		darwin.apple_sdk.frameworks.WebKit
 		darwin.apple_sdk.frameworks.SystemConfiguration
 		darwin.apple_sdk.frameworks.CoreSevices
 		darwin.apple_sdk.frameworks.Security
+		# cargo-tauri # only if you want to cargo-tauri 
 	];
 }
 ```