Bugs/double submit null username (#79)

* updated maap help to version 1.0.1

* converted back to 1.0.0

* upgraded dps version to add feature disabling submit button/ saying last submitted info and fixing the null username bug

jupyterlab3/docker/Dockerfile

@@ -51,7 +51,7 @@ RUN jupyter labextension disable @jupyterlab/apputils-extension:announcements
 ###############################
 # Custom Jupyter Extensions
 ###############################
-RUN jupyter labextension install @maap-jupyterlab/dps-jupyter-extension@0.5.1 --no-build
+RUN jupyter labextension install @maap-jupyterlab/dps-jupyter-extension@0.5.2 --no-build
 
 # PyPi package prepended with 'maap' so it more easily discoverable
 RUN pip install maap-jupyter-server-extension==1.2.2