New title + slogan

Changed title and slogan as discussed in VC and in #14 (closed)

_includes/frontpage/title-content.html

 <div>
-    <h1>Helmholtz IT Services</h1>
-    <p>The Helmholtz Infrastructure for Federated ICT Services (HIFIS) ensures an excellent information environment for outstanding research in all Helmholtz research fields.</p>
+    <h1>Federated IT for Science</h1>
+    <p>HIFIS ensures an excellent information environment for outstanding research in all Helmholtz research fields.</p>
 </div>
 <div class="services-box">
     <div class="services-title-buttons">