Limit to 3 the number of articles on home page

webapp/src/app/editorialisation/components/wordpress-posts-list/wordpress-posts-list.component.html

 <div *ngIf="posts">
     <div class="row">
-        <div class="col-md-4" *ngFor="let post of posts" style="margin-top: 20px;">
+        <div class="col-md-4" *ngFor="let post of posts | slice:0:3" style="margin-top: 20px;">
                 <app-wordpress-posts-list-tile [post]='post'>
                     </app-wordpress-posts-list-tile>
         </div>