Use an outline for archive button

https://itou-inclusion.slack.com/archives/CU8ATF54L/p1725987031980959?thread_ts=1725294543.097019&cid=CU8ATF54L

itou/templates/apply/includes/siae_hiring_actions.html

@@ -52,7 +52,7 @@ <h2 class="visually-hidden">Actions rapides</h2>
             <div class="form-group col col-lg-auto">
                 <form method="post" action="{% url "apply:archive" job_application_id=job_application.pk %}">
                     {% csrf_token %}
-                    <button class="btn btn-lg btn-link-white btn-block btn-ico">
+                    <button class="btn btn-lg btn-outline-white btn-block btn-ico">
                         <i class="ri-archive-line font-weight-medium"></i>
                         <span>Archiver</span>
                     </button>