Use environment.yml instead of install script

cs-config/install.sh

@@ -1,12 +1,3 @@
 # bash commands for installing your package
 
-git clone -b master --depth 1 https://github.com/PSLmodels/OG-USA
-cd OG-USA
-
-# Explicitly add channels for looking up dependencies outside of
-# taxcalc and paramtools. If the channels are not specified like this,
-# the tests fail due to not being able to converge on a solution.
-conda config --add channels PSLmodels
-conda config --add channels conda-forge
-conda install scipy mkl dask matplotlib PSLmodels::taxcalc conda-forge::paramtools
 pip install -e .