Replace CloudNativeCon news with PromCon

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-  <a href="http://events.linuxfoundation.org/events/cloudnativecon-and-kubecon-europe">CloudNativeCon Europe 2017</a> (March 29–30) with a dedicated <a href="https://cloudnativeeu2017.sched.com/overview/type/Prometheus">Prometheus track</a>.
+  Sign up for news about <a href="https://promcon.io/2017-munich/">PromCon 2017</a>, August 17 - 18 in Munich!
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