chore(hero): take down GDD announcement

Author: Naomi Black

public/_includes/_hero-home.jade

@@ -4,10 +4,3 @@ header(class="background-sky l-relative")
         img(class="hero-logo" src='/resources/images/logos/angular2/angular.svg')
         h1.text-headline #{title}<br>#{subtitle}
         a(href="/docs/ts/latest/quickstart.html" class="hero-cta md-raised button button-large button-plain" md-button) Get Started
-
-
-    announcement-bar
-      .announcement-bar-slide.clearfix
-        img(src="/resources/images/logos/google/gdd-logo.png" width="64")
-        p <strong>Google Developer Day Beijing & Shanghai</strong> 12/2016
-        a(href="http://services.google.cn/fb/forms/gddcn2016/" target="_blank" class="button md-button") Register now