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

src/site/samples/swipe/index.markdown

Index: src/site/samples/swipe/index.markdown
diff --git a/src/site/samples/swipe/index.markdown b/src/site/samples/swipe/index.markdown
deleted file mode 100644
index 8c08fc5b159409b37f5e866545ab9f5769eeeab5..0000000000000000000000000000000000000000
--- a/src/site/samples/swipe/index.markdown
+++ /dev/null
@@ -1,25 +0,0 @@
----
-layout: default
-title: Touch Gestures and CSS 3D Transforms
-live_example_url: example/swipe.html
-
-header:
-  css: ["/samples/samples.css"]
----
-
-## {{ page.title }}
-
-This sample uses touch gestures and CSS 3D transforms to display a figure made
-up of a well known palindrome.
-If you are using a keyboard, spin the figure with the left and
-right arrow keys. On touch devices, use swipe gestures.
-
-Read the
-[source](https://github.com/dart-lang/sample-swipe).
-
-<iframe class="running-app-frame"
-        style="height:500px;width:100%;"
-        src="{{page.live_example_url}}">
-</iframe>
-
-See all [samples](/samples/)