chore(hero): update hero banner for ngconf livestream

Author: naomiblack

public/_includes/_hero-home.jade

@@ -7,6 +7,7 @@ header(class="background-sky")
 
 .banner.banner-floaty
   .banner-ng-annoucement
-    div(class="banner-text") Watch the ng-conf Live Stream May 4th-6th. 
+    div(class="banner-text")
+      p Watch the ng-conf Live Stream May 4th-6th. 
     div(class="banner-button")
-      a(href="https://www.ng-conf.org/#/extended" target="_blank") View Live Stream
+      a(href="https://www.ng-conf.org/#/extended" target="_blank" class="button md-button") View Live Stream