Mention where to find JupyterLab alternative

Author: fcollonval

README.md

@@ -42,7 +42,8 @@ JupyterLab
 ==========
 
 Due to major differences between the Jupyter Notebook and JupyterLab, the extensions in this
-repository will not work in JupyterLab.
+repository will not work in JupyterLab. You will find a list of alternative extensions for
+JupyterLab on [jupyterlab-contrib](https://jupyterlab-contrib.github.io/migrate_from_classical.html).
 
 
 Documentation

docs/source/autogen_scripts/autogen_nbextensions_list.py

@@ -56,6 +56,10 @@
 List of provided nbextensions
 =============================
 
+.. note::
+
+    For JupyterLab, alternative extensions can be found `there <https://jupyterlab-contrib.github.io/migrate_from_classical.html>`_.
+
 .. the hidden toc is used to suppress warnings about readmes which are
 .. not for individual nbextensions, but are linked to by nbextensions'
 .. individual readmes