message: feature: added details of teacher to course detail view. dummie picture at the moment. further functions and updates to be added.
diff: <h1>{{course?.name}}</h1>
  <div class="chip">
  <div *ngFor="let teacher of course.teachers">
  + <!-- dummie picture because of problems to access picture of teacher-->
  <img class="avatar" src="{{userService.user.getUserImageURL(30)}}" width="96" height="96">
  - {{teacher.profile.firstName + " " + teacher.profile.lastName }}
  + {{teacher.profile.firstName + " " + teacher.profile.lastName + " " + teacher.email}}
  </div>
  </div>
  <p>{{course?.description}}</p>
  