refactor: #1

package.xml

@@ -12,7 +12,9 @@
         <image src="URL_OPT_DIR/quiqqer/invoice/bin/images/Logo.jpg"/>
 
         <preview>
-            <!-- <image src="URL_OPT_DIR/quiqqer/invoice/bin/images/preview/log_settings.jpg"/> -->
+            <image src="URL_OPT_DIR/quiqqer/invoice/bin/images/preview/preview-1.png"/>
+            <image src="URL_OPT_DIR/quiqqer/invoice/bin/images/preview/preview-2.png"/>
+            <image src="URL_OPT_DIR/quiqqer/invoice/bin/images/preview/preview-3.png"/>
         </preview>
 
         <support>
@@ -36,4 +38,4 @@
         </provider>
 
     </package>
-</quiqqer>
\ No newline at end of file
+</quiqqer>