gh-150 Include the link to download the compatible shell

Author: ghillert

ui/app/scripts/shared/views/about.html

@@ -22,6 +22,12 @@ <h2>Data Flow Server Implementation</h2>
   </tbody>
 </table>
 
+<h2>Get the Spring Cloud Data Flow Shell</h2>
+
+<p class="index-page--subtitle">As an alternative to the Dashboard UI, you can also
+   <a href="https://repo.spring.io/release/org/springframework/cloud/spring-cloud-dataflow-shell/{{dataflowVersionInfo.app.version}}/spring-cloud-dataflow-shell-{{dataflowVersionInfo.app.version}}.jar"
+      target="_blank">download the compatible version of the Shell</a> ({{dataflowVersionInfo.app.version}}).</p>
+
 <h2>Need Help or Found an Issue?</h2>
 
 <table class="table table-hover">
@@ -33,10 +39,10 @@ <h2>Need Help or Found an Issue?</h2>
       <td>Sources</td><td><a target="_blank" href="https://github.com/spring-cloud/spring-cloud-dataflow">https://github.com/spring-cloud/spring-cloud-dataflow</a></td>
     </tr>
     <tr>
-      <td>Documentation</td><td><a target="_blank" href="http://docs.spring.io/spring-cloud-dataflow/docs/{{dataflowVersionInfo.versionAvailable ? dataflowVersionInfo.version : 'current'}}/reference/html/">http://docs.spring.io/spring-cloud-dataflow/docs/{{dataflowVersionInfo.versionAvailable ? dataflowVersionInfo.version : 'current'}}/reference/html/</a></td>
+      <td>Documentation</td><td><a target="_blank" href="http://docs.spring.io/spring-cloud-dataflow/docs/{{dataflowVersionInfo.app.version}}/reference/html/">http://docs.spring.io/spring-cloud-dataflow/docs/{{dataflowVersionInfo.app.version}}/reference/html/</a></td>
     </tr>
     <tr>
-      <td>API Docs</td><td><a target="_blank" href="http://docs.spring.io/spring-cloud-dataflow/docs/{{dataflowVersionInfo.versionAvailable ? dataflowVersionInfo.version : 'current'}}/api/">http://docs.spring.io/spring-cloud-dataflow/docs/{{dataflowVersionInfo.versionAvailable ? dataflowVersionInfo.version : 'current'}}/api/</a></td>
+      <td>API Docs</td><td><a target="_blank" href="http://docs.spring.io/spring-cloud-dataflow/docs/{{dataflowVersionInfo.app.version}}/api/">http://docs.spring.io/spring-cloud-dataflow/docs/{{dataflowVersionInfo.app.version}}/api/</a></td>
     </tr>
     <tr>
       <td>Support Forum</td><td><a target="_blank" href="http://stackoverflow.com/questions/tagged/spring-cloud">http://stackoverflow.com/questions/tagged/spring-cloud</a></td>