[bisq-network/bisq] Improve readability of the daily burnt BSQ chart (#3890)

[dmos62]

Organized imports and reformated code with IntelliJ. Made CSS changes to the chart. Namely, the plot line width was reduced to 1px, and the plot line colors were changed to mirror more closely the perceived color of the stacked area chart above and, at the same time, they were also made to adapt to the different backgrounds under light and dark modes.

![bsq burnt after style changes](https://user-images.githubusercontent.com/2715476/72664676-4120b280-3a09-11ea-8d72-fd434f6636e9.gif)

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