Logo with text

[jbusecke]

Separating #130 (comment) out here.

Ill try to work on this in a bit.

@keewis @tinaok:

• do we have a font that we like
• what is the preferred capitalization? xDGGS, xdggs, Xdggs?

[keewis]

I don't think we have a preferred font, so feel free to try out various fonts if you'd like. If I'd do this I'd go with something like xarrays font (but that does not have to restrict you).

For the spelling I personally prefer all lower-case (similar to xarray).