move data to separate file; add link field to data; save locations to…

[alpiepho]

… local storage

I am just starting to learn data visualization and really like how you used D3. I made a couple modifications toward porting for other projects. The first mini-project using this can be found at https://alpiepho.github.io/state-web-development-2018-2019-withD3-static/

Thanks again for sharing your work, Al