moved resusable content to shortcodes

layouts/shortcodes/persistentdata.html

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+<div>
+	<p>Rancher uses etcd as datastore. When using the Single Node Install, the embedded etcd will be used. The persistent data will be stored in <code>/var/lib/rancher</code> inside the container. You can bind mount a host volume to this location to preserve data on the host it is running on.</p>
+
+	<p><b>Command</b></p>
+
+	<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4">
+	docker run -d -p 80:80 -p 443:443 \
+	  -v /host/rancher:/var/lib/rancher \
+	  rancher/rancher
+	</pre>
+</div>