Update della/stellar installation instructions to use pip

[dpanici]

These should work, based off here: https://github.com/PrincetonUniversity/intro_ml_libs/tree/master/jax#pip-installation

conda create --name desc-env 'python==3.11'
conda activate desc-env
pip install -U "jax[cuda12_pip]" -f https://storage.googleapis.com/jax-releases/jax_cuda_releases.html

# remove the jax lines from requirements.txt, as we already have installed them above
sed -i '/jax/d' ./requirements.txt
# then install as usual
pip install --editable .
# optionally install developer requirements (if you want to run tests)
pip install -r devtools/dev-requirements.txt

[dpanici]

These seem to give a driver warning though, and also would be ideal to use the cuda that is already installed locally instead of getting it through this pip call

[dpanici]

Resolved by #1067