feat: Add close event

- Frame elements now can be closed
- Event is added in template
- Action leads back in history

source/screens/demo/examples/ui/explorer.njk

@@ -182,6 +182,4 @@ tags:
 
 {%- block script %}
 	{{ super() }}
-	<script src="{{ pageBase }}js/app.js"></script>
-	<script></script>
 {% endblock %}