art: Use a transparent logo for dark themes

As helpful user frebib pointed out, our logo doesn't render nicely when
github users use the dark theme. This has already been complained about
by others in:

https://github.community/t/support-theme-context-for-images-in-light-vs-dark-mode/147981/2

For now, we'll switch to a transparent background.
This commit is contained in:
James Shubin
2021-01-31 18:00:47 -05:00
parent 336a38081a
commit 3bd8658da6

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