Add dynamic host for backend

dmnverifierfrontend/src/main/resources/META-INF/resources/js/dmnVerifier.js

-let rootUrl = 'http://dmn.fg-bks.uni-koblenz.de:8080/';
+let rootUrl = 'http://' + window.location.hostname + ':8080/';
 let dmnApi = rootUrl + 'api/dmn/';
 
 /**