About: fix image URL

Resolves #908

Author: oodamien

ui/src/app/about/about/about.component.html

@@ -39,44 +39,44 @@ <h2>Need Help or Found an Issue?</h2>
       <ul id="dataFlowVersionLinksTable" class="list-icons">
         <li>
           <a target="_blank" href="http://cloud.spring.io/spring-cloud-dataflow/">
-            <img src="/assets/img/project-page.png" width="50px" alt="">
+            <img src="/dashboard/assets/img/project-page.png" width="50px" alt="">
             <strong>Project Page</strong>
             <span>Quick overview of Spring Cloud Data Flow Project.</span>
           </a>
         </li>
         <li>
           <a target="_blank" href="https://github.com/spring-cloud/spring-cloud-dataflow">
-            <img src="/assets/img/github.png" width="50px" alt="">
+            <img src="/dashboard/assets/img/github.png" width="50px" alt="">
             <strong>Sources</strong>
             <span>Spring Cloud Data Flow Project is an Open Source Project.</span>
           </a>
         </li>
         <li>
           <a target="_blank"
              href="http://docs.spring.io/spring-cloud-dataflow/docs/{{ dataflowVersionInfo.versionInfo.core.version }}/reference/htmlsingle/">
-            <img src="/assets/img/documentation.png" width="50px" alt="">
+            <img src="/dashboard/assets/img/documentation.png" width="50px" alt="">
             <strong>Documentation</strong>
             <span>Learn more about the product features.</span>
           </a>
         </li>
         <li>
           <a target="_blank"
              href="http://docs.spring.io/spring-cloud-dataflow/docs/{{ dataflowVersionInfo.versionInfo.core.version }}/api/">
-            <img src="/assets/img/api.png" width="50px" alt="">
+            <img src="/dashboard/assets/img/api.png" width="50px" alt="">
             <strong>API Docs</strong>
             <span>Learn more about the REST-APIs.</span>
           </a>
         </li>
         <li>
           <a target="_blank" href="http://stackoverflow.com/questions/tagged/spring-cloud-dataflow">
-            <img src="/assets/img/forum.png" width="50px" alt="">
+            <img src="/dashboard/assets/img/forum.png" width="50px" alt="">
             <strong>Support Forum</strong>
             <span>You need help?</span>
           </a>
         </li>
         <li>
           <a target="_blank" href="https://github.com/spring-cloud/spring-cloud-dataflow/issues">
-            <img src="/assets/img/tracker.png" width="50px" alt="">
+            <img src="/dashboard/assets/img/tracker.png" width="50px" alt="">
             <strong>Issue Tracker</strong>
             <span>Report an issue or request for a new feature.</span>
           </a>
@@ -87,7 +87,7 @@ <h2>Need Help or Found an Issue?</h2>
     <hr>
 
     <div class="shell">
-      <img src="/assets/img/shell.png" width="383px" alt="">
+      <img src="/dashboard/assets/img/shell.png" width="383px" alt="">
       <div class="shell-content">
         <h2 *ngIf="dataflowVersionInfo">Get the Spring Cloud Data Flow Shell</h2>
         <p class="index-page--subtitle">As an alternative to the Dashboard UI, you can also