Updating the samples page to reflect the examples that have been retired.

src/site/samples/jsonp/example/index.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library jsonp_sample;
-
-import 'dart:html';
-import 'dart:js';
-
-const List<String> FIELDS = const ['name', 'description', 'size',
-                                   'watchers', 'forks'];
-
-TableElement table = querySelector('#repo-table');
-
-addTableHeadRow() {
-  var tr = new TableRowElement();
-  for (var field in FIELDS) {
-    tr.append(new Element.tag('th')..text = field);
-  }
-  table.querySelector('thead').append(tr);
-}
-
-addTableBodyRow(JsObject repo) {
-  var tr = new TableRowElement();
-  for (var field in FIELDS) {
-    var td = new TableCellElement();
-    if (field == 'name') {
-      td.append(new AnchorElement()
-          ..href = repo['html_url']
-          ..text = repo[field]);
-    } else {
-      td.text = repo[field].toString();
-    }
-    tr.append(td);
-  }
-  table.querySelector('tbody').append(tr);
-}
-
-void main() {
-  // Create a jsObject to handle the response.
-  context['processData'] = (response) {
-    addTableHeadRow();
-    for (var repo in response['data']) {
-      addTableBodyRow(repo);
-    }
-  };
-
-  ScriptElement script = new Element.tag("script");
-  script.src = "https://api.github.com/users/dart-lang/repos?callback=processData";
-  document.body.children.add(script);
-}