Generate & return webauthn registration challenge

templates/settings/add_webauthn_page.html

@@ -0,0 +1,14 @@
+{% extends "base_settings_page.html" %}
+{% block content %}
+<div style="max-width: 700px;">
+
+    <p>In order, to continue, please insert your security key & approve the registration request.</p>
+
+    <script>
+        const OPAQUE_STATE = "{{ opaque_state }}";
+        const REGISTRATION_CHALLENGE = JSON.parse(decodeURIComponent("{{ challenge_json }}"));
+    </script>
+
+</div>
+
+{% endblock content %}