Change some network graph plotting defaults

[TorkelE]

E.g. here:

The ticks and grid lines are not really necessary for this purpose and mostly clutters up the plot. It might make sense to, by default, remove these.

[vyudu]

Ah I remember why I didn't do this, the hidedecorations! and other functions that remove the ticks and grid lines are in CairoMakie and not GraphMakie itself. I suppose we could make one of the Makie backends a dependency of the ext?

[vyudu]

Or just regular Makie, I'll do that instead.