improve python start up (and version) documentation

[emillipede]

add

• written narrative guide to read me
• instructions comparable to this setup guide from another unrelated by well-documented repository

[emillipede]

@Cdower thank you again for sharing this guide with @isabelle-wagenvoord

do you recommend I add it to the readme?

git clone git@github.com:Public-Tree-Map/public-tree-map-data-pipeline.git
cd public-tree-map-data-pipeline
sudo apt update
sudo apt install make nodejs npm
./python-env.sh
# you will probably get an error related to the line source activate public-tree-map if you run the following two commands
echo 'export PATH="$HOME/miniconda/bin:$PATH"' >> ~/.$(basename $SHELL)rc conda init $(basename $SHELL)
# Restart your terminal/shell
cd public-tree-map-data-pipeline
npm i
conda activate public-tree-map
# test with
make local-only
# if make local-only works then run
make release