Move nextcloud_login to frontend crate

crates/frontend/public/templates/pages/login.html

@@ -17,6 +17,6 @@
   {% if let Some(OidcProviderData {name, redirect_url}) = oidc_data %}
   <a href="{{ redirect_url }}">Login with {{ name }}</a>
   {% endif %}
-
-  {% endblock %}
 </div>
+
+{% endblock %}

crates/frontend/public/templates/pages/nextcloud_login/form.html

@@ -0,0 +1,13 @@
+{% extends "layouts/default.html" %}
+
+{% block imports %}
+{% endblock %}
+
+{% block content %}
+<p>Authorize application to act on your behalf, {{ username }}?</p>
+<form method="POST">
+  <label for="app_name">App name</label>
+  <input type="text" value="{{ app_name }}" name="app_name"/>
+  <button type="submit">Authorize</button>
+</form>
+{% endblock %}

crates/frontend/public/templates/pages/nextcloud_login/success.html

@@ -0,0 +1,8 @@
+{% extends "layouts/default.html" %}
+
+{% block imports %}
+{% endblock %}
+
+{% block content %}
+  <p>Authorized app {{ app_name }}, you may now close this page.</p>
+{% endblock %}