Admin Section: misc templates corrections and improvments

* reset admin vertical menu custom styles
* disable icons in admin vertical menu
* fix main content positioning in admin section
* fix table appearance in admin crud template
* new scope/center form: move submit button in record_action sticky area
* edit scope/center form: move submit button in record_action sticky area
* improve homogeneity in admin index pages: centers/scopes/users/jobs
* remove centered div old tags

src/Bundle/ChillAsideActivityBundle/src/Resources/views/asideActivity/_delete.html.twig

@@ -1,4 +1,4 @@
-<div class="{% block crud_content_main_div_class %}col-10 centered{% endblock %}">
+
 	{% block crud_content_header %}
 		<h1>{{ ('crud.'~crud_name~'.title_delete')|trans({ '%as_string%': 'Aside Activity' }) }}</h1>
 	{% endblock crud_content_header %}
@@ -27,4 +27,4 @@
 	</ul>
 
 	{{ form_end(form) }}
-</div>
+