build sankey toggle into svg

[jordansread]

right now we do an image swap. We should handle it within a single svg so it is standalone and smoother.

This is pending us actually wanting to move ahead w/ showing acreage, which I will defer to @gjahansen2 on. Won't work on this unless we are going to keep it.

[gjahansen2]

Let's see what WDNR staff thinks

[jordansread]

I think this is not going to happen. Working on making the toggle better @thongsav-usgs