docs: remove old --nw flag (#467)

Author: d-koppenhagen

docs/getting-started.md

@@ -126,7 +126,7 @@ ng build
 Now, lets build Scully and turn your Angular app into a pre-rendered static site.
 
 ```bash
-npm run scully -- --nw
+npm run scully
 ```
 
 Congratulations! You have turned your Angular application into a wicked fast pre-rendered one thanks to Scully.

docs/getting-started_es.md

@@ -128,7 +128,7 @@ ng build
 Ahora, vamos a construir Scully y convertir tu aplicación Angular en un sitio estático pre-renderizado.
 
 ```bash
-npm run scully -- --nw
+npm run scully
 ```
 
 ¡Felicitaciones! Has convertido tu aplicación Angular en una aplicación perversamente rápida pre-renderizada gracias a Scully.