fracking: disable autoscale buttons for now

See https://github.com/concord-consortium/lab-grapher/issues/6
fracking: pretty up graph (rm bkgd color, serifs)

[#66090660]

The minimalistic look is closer to what NGS spec'ed anyway.
fracking: fix typo ("contaiminantGraph")
Fracking: Add popup keys to graphs

[#66090660]

For the time being, this is very special purposed for the fracking model. However, it might be worth generalizing for use by other models and/or the Lab grapher.