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

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

add breakpoints md- and sm-

src/Bundle/ChillEventBundle/Resources/views/Event/show.html.twig

@@ -118,7 +118,7 @@
     </ul>
 
     <div style="margin-bottom: 10em;">
-        <div class="grid-8">
+        <div class="col-8">
             {{ form_start(form_add_participation_by_person) }}
             <div class="input-group">
                 {{ form_widget(form_add_participation_by_person.person_id, { 'attr' : {
@@ -133,7 +133,7 @@
             {{ form_end(form_add_participation_by_person) }}
         </div>
 
-        <div class="grid-4">
+        <div class="col-4">
             {{ form_start(form_export, {'attr': {'id': 'export_tableur'}}) }}
             <div class="input-group">
                 {{ form_widget(form_export.format, { 'attr' : { 'class': 'custom-select' } }) }}