refactor: added new README visual

Author: mfranzke

README.md

@@ -1,6 +1,6 @@
 <!-- markdownlint-configure-file { "MD013": false } -->
 
-<img src="source/samples/images/header_image_0.guetzli.jpg" width="1182" height="332" alt="" srcset="source/samples/images/header_image_0.guetzli.2x.jpg 2x" style="width:100%;height:auto">
+<img src="source/samples/images/header_image_0.guetzli.jpg" width="1012" height="337" alt="" srcset="source/samples/images/header_image_0.guetzli.2x.jpg 2x, source/samples/images/header_image_0.guetzli.3x.jpg 3x" style="width:100%;height:auto">
 
 # DB UI Core