[Fix #1691] Do not attempt to 'wrap' <p>s in other <p>s

It cannot be done because <p>s don't nest in HTML, so use
<div>s for the wrapping instead

app/views/dossiers/etapes/_etape1.html.haml

@@ -15,7 +15,7 @@
       %h2#titre-procedure.text-info
         = @facade.procedure.libelle
 
-      %p#description_procedure{ style: 'width: 95%;', class: (@facade.entreprise.nil? ? '' : 'mask') }
+      #description_procedure{ style: 'width: 95%;', class: (@facade.entreprise.nil? ? '' : 'mask') }
         = h sanitize(@facade.procedure.description)
 
         - if @facade.procedure.lien_site_web.present?

app/views/new_user/dossiers/identite.html.haml

@@ -8,7 +8,7 @@
 
       %h2.procedure-title
         = @dossier.procedure.libelle
-      %p.procedure-description
+      .procedure-description
         = h sanitize(@dossier.procedure.description)
 
     .column

app/views/users/sessions/new.html.haml

@@ -19,7 +19,7 @@
 
         %h2.procedure-title
           = @dossier.procedure.libelle
-        %p.procedure-description
+        .procedure-description
           = h sanitize(@dossier.procedure.description)
 
     .column.auth-form

app/views/users/siret/_pro.html.haml

@@ -5,7 +5,7 @@
   %h2#titre-procedure.text-info
     = @procedure.libelle
 
-  %p
+  %div
     = sanitize(@procedure.description)
 
   %br