move duplicate code in static marketing sites to marketing.html block templates

copyright.html

@@ -1,19 +1,5 @@
 <%inherit file="marketing.html" />
 
-<header class="announcement">
-  <div class="anouncement-wrapper">
-  <nav>
-    <h1><a href="/t/mitx_global.html">MITx</a></h1>
-    <a class="modal login" href="#login">Log In</a>
-  </nav>
-
-    <section>
-      <h1>MITx</h1>
-      <h2>An MIT Education Anywhere. For free.</h2>
-    </section>
-  </div>
-</header>
-
 <section class="copyright">
 
   <div>