fix(website): Pagination in child item groups

Item groups pages which had child item groups were not paged at all
despite having next, prev buttons
diff --git a/erpnext/setup/doctype/item_group/item_group.py b/erpnext/setup/doctype/item_group/item_group.py
index 6bc9036..f258f7d 100644
--- a/erpnext/setup/doctype/item_group/item_group.py
+++ b/erpnext/setup/doctype/item_group/item_group.py
@@ -136,7 +136,10 @@
 			rgt = ('<', item_group.rgt),
 		),
 		or_filters = search_filters,
-		order_by = 'weightage desc, name asc')
+		order_by = 'weightage desc, name asc',
+		start = start,
+		limit = limit
+	)
 
 	return [get_item_for_list_in_html(r) for r in data]