Add PromCon live streaming and Twitter to news banner

Signed-off-by: Julius Volz <julius.volz@gmail.com>

content/index.html

@@ -13,7 +13,7 @@ layout: jumbotron
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-  See you at PromCon in Munich on August 9 &amp; 10, 2018&nbsp;&nbsp;—&nbsp;&nbsp;<a href="https://promcon.io/2018-munich/schedule/">Schedule</a>
+  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>
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