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

module/CLI/config/dependencies.config.php

@@ -14,6 +14,7 @@ return [
             Command\Shortcode\ResolveUrlCommand::class => AnnotatedFactory::class,
             Command\Shortcode\ListShortcodesCommand::class => AnnotatedFactory::class,
             Command\Shortcode\GetVisitsCommand::class => AnnotatedFactory::class,
+            Command\Shortcode\GeneratePreviewCommand::class => AnnotatedFactory::class,
             Command\Visit\ProcessVisitsCommand::class => AnnotatedFactory::class,
             Command\Config\GenerateCharsetCommand::class => AnnotatedFactory::class,
             Command\Config\GenerateSecretCommand::class => AnnotatedFactory::class,