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

src/site/samples/jsonp/index.markdown

Index: src/site/samples/jsonp/index.markdown
diff --git a/src/site/samples/jsonp/index.markdown b/src/site/samples/jsonp/index.markdown
deleted file mode 100644
index d9358cb70b8c8309d6efaa488e6379351b8a8ff6..0000000000000000000000000000000000000000
--- a/src/site/samples/jsonp/index.markdown
+++ /dev/null
@@ -1,23 +0,0 @@
----
-layout: default
-title: Fetching Data Using JSONP
-live_example_url: example/index.html
-
-header:
-  css: ["/samples/samples.css"]
----
-
-## {{ page.title }}
-
-This sample uses `JSONP` and the `dart:js` library to retrieve data about
-Github repos belonging to the user dart-lang.
-
-Read the
-[source](https://github.com/dart-lang/sample-jsonp).
-
-<iframe class="running-app-frame"
-        style="height:500px;width:100%;"
-        src="{{page.live_example_url}}">
-</iframe>
-
-See all [samples](/samples/)