add snapshot wiki link

tubearchivist/home/templates/home/settings.html

@@ -157,7 +157,7 @@
             <h2 id="snapshots">Snapshots</h2>
             <div class="settings-item">
                 <p>Current system snapshot: <span class="settings-current">{{ config.application.enable_snapshot }}</span></p>
-                <i>Automatically create daily deduplicated snapshots of the index, stored in Elasticsearch. Read first before activating: Wiki.</i><br>
+                <i>Automatically create daily deduplicated snapshots of the index, stored in Elasticsearch. Read first before activating: <a target="_blank" href="https://github.com/tubearchivist/tubearchivist/wiki/Settings#snapshots">Wiki</a>.</i><br>
                 {{ app_form.application_enable_snapshot }}
             </div>
             <div>