Fix binder build

[keckelt]

I've copied the files form the current cookie cutter template but it does not work yet:

Step 47/53 : RUN chmod +x binder/postBuild
 ---> Running in e09a6662cc88
Removing intermediate container e09a6662cc88
 ---> d1e83b21e432
Step 48/53 : RUN ./binder/postBuild
 ---> Running in f1fddc7253b9
No broken requirements found.
ERROR: File "setup.py" or "setup.cfg" not found. Directory cannot be installed in editable mode: /home/jovyan

         /srv/conda/envs/notebook/bin/python3 -m pip check 


         /srv/conda/envs/notebook/bin/python3 -m pip install -e . 


ERROR 1 /srv/conda/envs/notebook/bin/python3 -m pip install -e .
Removing intermediate container f1fddc7253b9
The command '/bin/sh -c ./binder/postBuild' returned a non-zero code: 1Built image, launching...
Failed to connect to event stream

https://mybinder.org/v2/gh/jku-vds-lab/jupyterlab_nbprovenance/binder?labpath=%2Flab%2Ftree%2Fbinder%2Fdemo.ipynb