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

src/site/samples/gauge/index.markdown

Index: src/site/samples/gauge/index.markdown
diff --git a/src/site/samples/gauge/index.markdown b/src/site/samples/gauge/index.markdown
deleted file mode 100644
index e2a66342f9e548c2d82f935c5caa4b52cb69eab4..0000000000000000000000000000000000000000
--- a/src/site/samples/gauge/index.markdown
+++ /dev/null
@@ -1,30 +0,0 @@
----
-layout: default
-title: Using the Google Charts Visualization API
-live_example_url: example/gauge.html
-
-header:
-  css: ["/samples/samples.css"]
----
-
-## {{ page.title }}
-
-This code derives from the Google Charts JavaScript API
-[Gauge Visualization](
-https://developers.google.com/chart/interactive/docs/gallery/gauge#Example)
-examples. The example uses the `dart:js` library for Dart and JavaScript
-interoperability.
-
-Read the [dart:js API
-docs](http://api.dartlang.org/docs/releases/latest/dart_js.html).
-
-Read the
-[source](https://github.com/dart-lang/sample-gauge).
-
-<iframe class="running-app-frame"
-        style="height:600px;width:100%;"
-        src="{{page.live_example_url}}"
-        align="middle">
-</iframe>
-
-See all [samples](/samples/)