feat: Adapt new hippie styles

- Use bound io class
- Remove over specified styles

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

@@ -19,12 +19,12 @@ tags:
 {% endblock %}
 
 {% block body %}
-	<div id="head">
+	<header class="io">
 		<h1>Formulare</h1>
 		<button data-action="add">Hinzufügen</button>
 		<button data-action="change">Ändern</button>
 		<hr>
-	</div>
+	</header>
 	<form id="form" action="">
 		<div id="grid">
 			<div>a</div>