Move screenshots to directory

Author: ivanvermeyen

README.md

@@ -15,7 +15,7 @@ It doesn't have to be!
 
 By installing StageFront with composer, adding the middleware and setting 3 variables in your `.env` file you are ready to go. As you will discover below, you also have a bunch more options available.
 
-![Login Screen](screenshot-login.png)
+![Login Screen](screenshots/screenshot-login.png)
 
 ## Requirements
 
@@ -120,7 +120,7 @@ If you want to include a different partial for other throttled pages, you can ch
 
 Text in this view can be changed via the [translation files](#translations-and-views).
 
-![Throttle Screen](screenshot-throttled.png)
+![Throttle Screen](screenshots/screenshot-throttled.png)
 
 ## Ignore URLs