batch replace grid- (scratch) by col- (bootstrap)

hand replace
* push- by offset-
* no-gutter by g-0

add breakpoints md- and sm-

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

@@ -25,7 +25,7 @@
 {% endblock %}
 
 {% block layout_wvm_content %}
-    <div class="grid-12 centered">
+    <div class="col-12 centered">
     <h1>{{ 'Configuration of person bundle' |trans }}</h1>
     
     <p>{{ 'person_admin.What would you like to configure ?'|trans }}</p>