Add node_modules, .DS_Store to .gitignore
"resources" folder with original NGS SVG artwork

[#65297336]
SlimerJS script for cropping SVG images to size

[#65297336]

Need to run 'svgo' on each image before *and* after.
optimize all the SVG resources before cropping

[#65297336]

(svgo, default settings)
crop all svg images using SlimerJS script

[#65297336]
reoptimize cropped images

[#65297336]
Execute, not evaluate, the loop in createWastePond
svg (and some png) images for fracking model
Use NGS artwork for fracking well and pond
Make sure dirtying the pond still works
Start using NGS palette (w/o gradients)
re-add pngs
explode Illustrator file to get gradients info
Refactor setupPatches to use (memoized) functions
Use gradients for most patch colors

TODO: we don't have good earth-tone gradients for rock2, rock3, and rock4.
Move fracking well labels and improve colors
Fracking model: rm ugly green graph background
fracking: better (but maybe too big) well labels
fracking: shrink the well labels
fracking: fix centering of well labels