Re-configured samples page.

src/site/samples/todo_with_delete/index.markdown

Index: src/site/samples/todo_with_delete/index.markdown
diff --git a/src/site/samples/todo_with_delete/index.markdown b/src/site/samples/todo_with_delete/index.markdown
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+---
+layout: default
+title: Removing elements from the DOM
+live_example_url: /docs/tutorials/remove-elements/examples/todo_with_delete/todo_with_delete.html
+header:
+  css: ["/samples/samples.css"]
+---
+
+## {{ page.title }}
+
+Enter text in the input field and press return. Point the mouse cursor at an
+item in the list. Click the item to delete it.
+
+This app shows how to programmatically remove an element from the DOM.
+
+In this example, when you click an item in the list, the event handler for
+the <li> element removes itself from the DOM tree. When the DOM tree
+changes, the web page refreshes.
+
+Read this [tutorial](/docs/tutorials/remove-elements/) for
+more detail, or read the
+[source](https://github.com/dart-lang/dart-tutorials-samples/tree/master/web/todo_with_delete).
+
+<iframe class="running-app-frame"
+        style="height:400px;width:40%;"
+        src="{{page.live_example_url}}">
+</iframe>
+
+See all [samples](/samples/)