Task/remove unused OnDestroy hook in self-hosting FAQ page component (#6436)

* Remove unused OnDestroy hook

apps/client/src/app/pages/faq/self-hosting/self-hosting-page.component.ts

@@ -1,10 +1,9 @@
 import { publicRoutes } from '@ghostfolio/common/routes/routes';
 import { GfPremiumIndicatorComponent } from '@ghostfolio/ui/premium-indicator';
 
-import { CUSTOM_ELEMENTS_SCHEMA, Component, OnDestroy } from '@angular/core';
+import { CUSTOM_ELEMENTS_SCHEMA, Component } from '@angular/core';
 import { MatCardModule } from '@angular/material/card';
 import { RouterModule } from '@angular/router';
-import { Subject } from 'rxjs';
 
 @Component({
   host: { class: 'page' },
@@ -14,13 +13,6 @@ import { Subject } from 'rxjs';
   styleUrls: ['./self-hosting-page.scss'],
   templateUrl: './self-hosting-page.html'
 })
-export class GfSelfHostingPageComponent implements OnDestroy {
+export class GfSelfHostingPageComponent {
   public pricingUrl = `https://ghostfol.io/${document.documentElement.lang}/${publicRoutes.pricing.path}`;
-
-  private unsubscribeSubject = new Subject<void>();
-
-  public ngOnDestroy() {
-    this.unsubscribeSubject.next();
-    this.unsubscribeSubject.complete();
-  }
 }