Added landing pages for new samples

src/site/samples/todo_with_delete/index.markdown

 ---

[Kathy Walrath, 2013/10/23 15:41:05]

todo_with_delete/ -> todo-with-delete/ ?

 layout: default
 title: Removing elements from the DOM

[Kathy Walrath, 2013/10/23 15:41:05]

Use Title Caps

 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/)
+See all [samples](/samples/).