Remove PromCon news bar

Was over a month ago, time to remove?
Signed-off-by: Scott Brenner <scott@scottbrenner.me>

content/index.html

@@ -12,10 +12,6 @@ layout: jumbotron
   </div>
 </div>
 
-<div class="newsbar">
-  We are at <a href="https://twitter.com/search?q=%23promcon2018">PromCon 2018</a>! Follow along live here: <a href="https://promcon.io/2018-munich/stream/">Live Stream</a>
-</div>
-
 <div class="container">
   <div class="row">
     <div class="col-md-3 col-sm-6 col-xs-12 feature-item">