added c++
add jupyterlab-git

removed rlax

added: flax, rlax

- changed version from 3.1.1 to 1.5.0
- removed pip install jax
- added mamba install -c conda-forge jax

- added casadi

- added pip update
- added mamba update
- try out commands without -y option (probably this will fail)

- Dockerfile using jupyter/tensorflow-notebook