Update nextflow-welcome.html

add extra .

jupyter-nextflow/nextflow-welcome.html

@@ -57,7 +57,7 @@ <h2 class=header>Get started with Nextflow</h2>
     <li>You can find your sample configuration file in the "data" directory.
       Copy it to a new "nextflow.config" file by running this command in the
       terminal: <code>cp
-      ./data/sample-nextflow-config.txt ./nextflow.config</code>
+      ../data/sample-nextflow-config.txt ./nextflow.config</code>
     <li>Launch a Hello World workflow by running this command in the terminal:
       <code>nextflow run hello</code>
   </ul>