Img src path will only work when deployed or in dev mode, not both. See angular/angular-cli#4517

Author: maeb

src/app/configurations/schedule/schedule-sidebar/schedule-sidebar.component.html

@@ -3,6 +3,6 @@ <h4>Quick Documentation</h4>
 <p>The server-side cron implementation uses the library cront4j.
   <a target="_blank" href="http://www.sauronsoftware.it/projects/cron4j/manual.php#p02">Cron4j Documentation</a>.
 </p>
-<img src="../../../../assets/images/cron_expression.png">
+<img src="veidemann/assets/images/cron_expression.png">
 <p>Valid from/to is used when a special occasion occours. e.g election campaign.</p>