Improved PreviewGenerator by composing an ImageBuilder that creates new Image objects fore each URL

config/autoload/phpwkhtmltopdf.global.php

@@ -2,7 +2,6 @@
 return [
 
     'phpwkhtmltopdf' => [
-        'files_location' => 'data/cache',
         'images' => [
             'binary' => 'bin/wkhtmltoimage',
             'type' => 'jpg',

config/autoload/preview-generation.global.php

@@ -0,0 +1,8 @@
+<?php
+return [
+
+    'preview_generation' => [
+        'files_location' => 'data/cache',
+    ],
+
+];