new: add a link to public article page from article and offres admin edit form

resources/views/Admin/Shop/Offers/form.blade.php

@@ -1,6 +1,15 @@
 {{ Form::open(['route' => 'Admin.Shop.Offers.store', 'id' => 'offer-form', 'autocomplete' => 'off']) }}
 <input type="hidden" name="id" value="{{ $offer['id'] ?? false }}">
 
+@if (($offer['id'] ?? false) && ($offer['article_id'] ?? false))
+    <div class="d-flex justify-content-end mb-3">
+        <a href="{{ route('Shop.Articles.show', ['id' => $offer['article_id']]) }}" class="btn btn-outline-primary" target="_blank" rel="noopener">
+            Voir la page publique de l'article
+            <i class="fa fa-external-link"></i>
+        </a>
+    </div>
+@endif
+
 <div class="row mb-3">
     <div class="col-8">
         <div class="row mb-3">