Replace doc writer hiring news with CloudNativeCon

Author: beorn7

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@@ -13,7 +13,7 @@ <h1>From metrics to insight</h1>
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-  Want to help improve our docs?&nbsp;&nbsp;—&nbsp;&nbsp;<a href="https://groups.google.com/forum/#!topic/prometheus-users/ExE2L7nViVc">We are looking for freelancers!</a>
+  <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>.
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