feat: Update drag page and other small things

- Add parameter to NewDiv class
- Add instance with content to drag page
- Drag page now also uses frame template
- Use macro for footer in explorer

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

@@ -152,14 +152,5 @@ tags:
 			</footer>
 		</section>
 	</main>
-	<footer class="io">
-		<nav>
-			<button>mode</button>
-			<span>mode-bar</span>
-		</nav>
-		<nav>
-			<div class="spacer a"></div>
-			<button>action</button>
-		</nav>
-	</footer>
+	{{ io.frameFooter('mode-bar') }}
 {% endblock %}