Convert observables to signals.

frontend/src/app/pages/home/home.component.html

@@ -1,11 +1,11 @@
 <h1 i18n>Last publications</h1>
 @if ((isLoading())) {
-    <h2 i18n>Publications loading...</h2>
-    <mat-spinner />
+  <h2 i18n>Publications loading...</h2>
+  <mat-spinner/>
 } @else {
-    @if (publications(); as publications) {
-        <app-publication-list [publications]="publications" />
-    } @else {
-        <h2 i18n>No any publication.</h2>
-    }
+  @if (publications(); as publications) {
+    <app-publication-list [publications]="publications"/>
+  } @else {
+    <h2 i18n>No any publication.</h2>
+  }
 }