Remove unnecessary infos from creator-/participant-home-page

src/app/components/shared/room-list/room-list.component.html

@@ -28,10 +28,3 @@
     </p>
   </mat-expansion-panel>
 </div>
-
-<mat-card id="no-sessions-card" *ngIf="rooms && rooms.length === 0">
-  <mat-card-header>
-    <mat-card-title *ngIf="baseUrl === 'creator'">Sie haben noch keine Sessions erstellt!</mat-card-title>
-    <mat-card-title *ngIf="baseUrl === 'participant'">Sie sind noch keiner Session beigetreten!</mat-card-title>
-  </mat-card-header>
-</mat-card>

src/app/components/shared/room-list/room-list.component.scss

@@ -46,11 +46,6 @@ mat-card-title {
   text-align: center;
 }
 
-#no-sessions-card {
-  background-color: var(--grey);
-  color: var(--primary);
-}
-
 mat-progress-spinner {
   margin-top: 30px;
 }