feat: implement employee deletion functionality

src/app/components/mitarbeiterverwaltung-view/mitarbeiterverwaltung-view.component.html

@@ -47,7 +47,7 @@
         <td>{{ employee.phone }}</td>
         <td>
           <button (click)="editEmployee(employee.id)">Edit</button>
-          <button>Delete</button>
+          <button (click)="deleteEmployee(employee.id)">Delete</button>
         </td>
       </tr>
       }