Task/remove unused OnDestroy hook in demo page component (#6383)

* Remove unused OnDestroy hook

apps/client/src/app/pages/demo/demo-page.component.ts

@@ -3,9 +3,8 @@ import { InfoItem } from '@ghostfolio/common/interfaces';
 import { NotificationService } from '@ghostfolio/ui/notifications';
 import { DataService } from '@ghostfolio/ui/services';
 
-import { Component, OnDestroy } from '@angular/core';
+import { Component } from '@angular/core';
 import { Router } from '@angular/router';
-import { Subject } from 'rxjs';
 
 @Component({
   host: { class: 'page' },
@@ -13,11 +12,9 @@ import { Subject } from 'rxjs';
   standalone: true,
   templateUrl: './demo-page.html'
 })
-export class GfDemoPageComponent implements OnDestroy {
+export class GfDemoPageComponent {
   public info: InfoItem;
 
-  private unsubscribeSubject = new Subject<void>();
-
   public constructor(
     private dataService: DataService,
     private notificationService: NotificationService,
@@ -40,9 +37,4 @@ export class GfDemoPageComponent implements OnDestroy {
 
     this.router.navigate(['/']);
   }
-
-  public ngOnDestroy() {
-    this.unsubscribeSubject.next();
-    this.unsubscribeSubject.complete();
-  }
 }