Add note on hiring technical writers

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@@ -13,7 +13,7 @@ layout: jumbotron
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-  PromCon 2016 videos are out!&nbsp;&nbsp;—&nbsp;&nbsp;<a href="https://www.youtube.com/watch?v=-JkxB0CiMjU&list=PLoz-W_CUquUlCq-Q0hy53TolAhaED9vmU">Watch them here</a>
+  Want to help improve our docs?&nbsp;&nbsp;—&nbsp;&nbsp;<a href="https://groups.google.com/forum/#!topic/prometheus-users/ExE2L7nViVc">We are hiring now!</a>
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