Merge branch 'Product/1629-onboardingOtherUniversities' into 'Sprint/2021-19'

Product/1629 onboarding other universities

See merge request !71

src/data/dfnaai.json

 {
+  "https://idp.uni-duisburg-essen.de/idp/shibboleth": {
+    "DisplayName": {
+      "de": "Universität Duisburg-Essen",
+      "en": "Universität Duisburg-Essen"
+    }
+  },
   "https://login.fh-aachen.de/idp/shibboleth": {
     "DisplayName": {
       "de": "Fachhochschule Aachen",