Merge branch 'feature/clb-lab-extension' into 'master'

Added clb-lab-extension

See merge request jupyter/clb-jupyter-nb-images!29

base/Dockerfile

@@ -84,6 +84,7 @@ RUN jupyter labextension disable ipcluster \
 # install additional labextensions
 RUN jupyter labextension install --no-build \
                              clb-jupyter-ext-query-params@3.2.0 \
+                             clb-lab-extension@0.9.0 \
                              ipycanvas@0.12.0
 # ipycanvas@0.12.0: Python part installed via spack (py-ipycanvas@0.12.0)