Set session timeout (#689)

Author: sven1103

user-interface/src/main/resources/application.properties

@@ -131,3 +131,5 @@ qbic.communication.documentation.url=${DOCUMENTATION_URL:https://qbicsoftware.gi
 qbic.communication.contact.email=${CONTACT_EMAIL:[email protected]}
 qbic.communication.contact.subject=${CONTACT_SUBJECT:Data Management Question}
 qbic.communication.api.url=${API_URL:https://download.qbic.uni-tuebingen.de/swagger-ui.html}
+################# Session handling ############################################
+server.servlet.session.timeout=${SESSION_TIMEOUT:30m}