preload course json for a faster display

src/Bundle/ChillPersonBundle/Resources/views/AccompanyingCourse/layout.html.twig

@@ -1,5 +1,9 @@
 {% extends "@ChillMain/layoutWithVerticalMenu.html.twig" %}
 
+{% block head_custom %}
+<link rel="preload" href="{{ preload(path('chill_api_single_accompanying_course__entity', {'id': accompanyingCourse.id, '_format': 'json' }), {as: 'fetch'}) }}" as="fetch" />
+{% endblock %}
+
 {% block top_banner %}
     {{ include('@ChillPerson/AccompanyingCourse/banner.html.twig', { title: block('title') }) }}
 {% endblock %}
@@ -17,7 +21,7 @@
         'layout': '@ChillPerson/menu.html.twig',
         'args' : { 'accompanyingCourse': accompanyingCourse }
     }) }}
-    
+
     {% block block_post_menu %}
     {% endblock %}