Update homepage to say DSpace 9

Author: tdonohue

src/app/home-page/home-news/home-news.component.html

@@ -2,7 +2,7 @@
   <div class="container">
     <div class="d-flex flex-wrap">
       <div>
-        <h1 class="display-3">DSpace 8</h1>
+        <h1 class="display-3">DSpace 9</h1>
         <p class="lead">DSpace is the world leading open source repository platform that enables organisations to:</p>
       </div>
     </div>

src/themes/dspace/app/home-page/home-news/home-news.component.html

@@ -3,7 +3,7 @@
     <div class="jumbotron jumbotron-fluid">
       <div class="d-flex flex-wrap">
         <div>
-          <h1 class="display-3">DSpace 8</h1>
+          <h1 class="display-3">DSpace 9</h1>
           <p class="lead">DSpace is the world leading open source repository platform that enables
             organisations to:</p>
         </div>