Promote PromCon 2017 videos in newsbar

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-  CloudNativeCon 2017 videos are out!&nbsp;&nbsp;—&nbsp;&nbsp;<a href="https://www.youtube.com/watch?v=uV_sh7_lVw8&list=PLqm7NmbgjUExeDZU8xb2nxz-ysnjuC2Mz&index=1">Watch the Prometheus track here</a>
+  <a href="https://promcon.io/2017-munich/">PromCon 2017</a> videos are out!&nbsp;&nbsp;—&nbsp;&nbsp;<a href="https://www.youtube.com/watch?v=4Pr-z8-r1eo&list=PLoz-W_CUquUlnvoEBbqChb7A0ZEZsWSXt">Watch the recorded talks on Youtube!</a>
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