Update nextflow-welcome.html

remove para about moving to pd at bottom

jupyter-nextflow/nextflow-welcome.html

@@ -61,9 +61,4 @@ <h2 class=header>Get started with Nextflow</h2>
     <li>Launch a Hello World workflow by running this command in the terminal:
       <code>nextflow run hello</code>
   </ul>
-  <p>Since the /pd directory is the only directory that will allow files to persist
-    once the workspace is closed, if you make changes to your <code>nextflow.config</code> file, 
-    you may want to move or copy the nextflow.config to the /pd to retain your changes. 
-    Move it to the /pd directory by running this command in the terminal: <code>mv nextflow.config ./pd</code>
-  </p>
 </div>