refactor: initialize config via APP_INITIALIZER

Closes #181

src/app/modules/about/about-page/about-page.component.ts

@@ -23,7 +23,7 @@ import {ConfigProvider} from '../../config/config.provider';
   styleUrls: ['about-page.scss'],
 })
 export class AboutPageComponent implements OnInit {
-  content: Promise<SCAboutPage>;
+  content: SCAboutPage;
 
   constructor(
     private readonly route: ActivatedRoute,
@@ -33,12 +33,11 @@ export class AboutPageComponent implements OnInit {
   async ngOnInit() {
     const route = this.route.snapshot.url.map(it => it.path).join('/');
 
-    this.content = new Promise(resolve => {
-      this.configProvider
-        .getValue('aboutPages')
-        .then(value =>
-          resolve((value as SCAppConfiguration['aboutPages'])[route] ?? {}),
-        );
-    });
+    this.content =
+      (
+        this.configProvider.getValue(
+          'aboutPages',
+        ) as SCAppConfiguration['aboutPages']
+      )[route] ?? {};
   }
 }

src/app/modules/about/about-page/about-page.html

@@ -19,7 +19,7 @@
       <ion-menu-button></ion-menu-button>
       <ion-back-button></ion-back-button>
     </ion-buttons>
-    <ion-title *ngIf="content | async as content; else titleLoading">{{
+    <ion-title *ngIf="content; else titleLoading">{{
       'title' | translateSimple: content
     }}</ion-title>
     <ng-template #titleLoading>
@@ -29,7 +29,7 @@
     </ng-template>
   </ion-toolbar>
 </ion-header>
-<ion-content *ngIf="content | async as content">
+<ion-content *ngIf="content">
   <about-page-content
     *ngFor="let element of content.content"
     [content]="element"