apply ckeditor on multiple entities

Apply ckeditor into:

* activity;
* task;
* document;
* accompanying periods

src/Bundle/ChillDocStoreBundle/Resources/views/PersonDocument/show.html.twig

@@ -45,7 +45,7 @@
             <span class="chill-no-data-statement">{{ 'Any description'|trans }}</span>
             {% else %}
             <blockquote class="chill-user-quote">
-                {{ document.description }}
+                {{ document.description|chill_markdown_to_html }}
             </blockquote>
             {% endif %}
         </dd>