OEL-1522: Improve theme naming for document group. Theming following ewcms but with bcl classes.

templates/content/field--oe-document-reference--oe-document.html.twig → templates/content/field--oe-document-reference--oe-document--oe-document.html.twig

@@ -7,5 +7,7 @@
  */
 #}
 {% for item in items %}
-  {{ item.content }}
+  <div{{ not loop.last ? ' class="mb-3"' }}">
+    {{ item.content }}
+  </div>
 {% endfor %}

templates/content/field--oe-document-reference--oe-document-group.html.twig → templates/content/field--oe-document-reference--oe-documents--oe-document-group.html.twig

 {#
 /**
  * @file
- * Field template of the document group reference entity.
+ * Field template of the document reference document group entity.
  *
  * @see ./core/themes/stable/templates/field/field.html.twig
  */
 #}
 {% for item in items %}
-  {% if item.content['#media'] is empty %}
-    <h6 class="mt-4 mb-4">{{ item.content }}</h6>
-  {% else %}
-    <div class="ps-4">
-      {{ item.content }}
-    </div>
-  {% endif %}
+  <div class="ps-4{{ not loop.last ? ' mb-3' }}">
+    {{ item.content }}
+  </div>
 {% endfor %}

templates/content/field--oe-document-reference--oe-title--oe-document-group.html.twig

+{#
+/**
+ * @file
+ * Field template of the document reference document group title entity.
+ *
+ * @see ./core/themes/stable/templates/field/field.html.twig
+ */
+#}
+{% for item in items %}
+  <h3 class="fs-4 mt-3 mb-2">{{ item.content }}</h3>
+{% endfor %}