Add archived newsletters link

Signed-off-by: Toomore Chiang <[email protected]>

Author: toomore

templates/base_subscribe.html

@@ -46,7 +46,10 @@
   {% block body %}{% endblock %}
   <footer class="footer" style="margin-top: 50px;">
     <div class="content has-text-centered">
-      <p><a href="https://volunteer.coscup.org/docs/zh-TW/secretary_team/overview/">COSCUP 行政組</a>與電子報訂閱服務</p>
+      <p>
+        <a href="https://volunteer.coscup.org/docs/zh-TW/secretary_team/overview/">COSCUP 行政組</a>與電子報訂閱服務<br>
+        <a href="https://volunteer.coscup.org/docs/zh-TW/about_coscup/newsletters/overview/">舊報攤（過往電子報）</a> | <a href="https://volunteer.coscup.org/docs/about_coscup/newsletters/overview/">Archived Newsletters</a>
+      </p>
     </div>
   </footer>
   <script src="/js/vue.min.js"></script>