fix(accessibility): add accessibility attributes to news tabs

src/app/post/components/post-header/post-header.component.html

@@ -9,12 +9,14 @@
   </div>
 
   <nav>
-    <div role="tablist" class="navigation">
+    <div role="tablist" class="navigation" aria-label="Filtrer les actualités">
       <div
         *ngFor="let tag of tags.others"
         class="tag"
         role="tab"
         tabindex="0"
+        aria-controls="posts"
+        [attr.aria-selected]="tag.slug === mainActiveTag.slug ? true : false"
         [ngClass]="{ active: tag.slug === mainActiveTag.slug || tag.name === mainActiveTag.slug }"
         (click)="activateTag(tag)"
         (keydown.enter)="activateTag(tag)"

src/app/post/components/post-list/post-list.component.html

 <app-post-header />
-<div class="section-container news">
+<div class="section-container news" role="tabpanel" id="posts">
   <div *ngIf="!isLoading && allPosts.length === 0">
     <p>Aucun résultat ne correspond à votre recherche.</p>
   </div>