Use white logo in github dark mode
Use white logo in github dark mode

I noticed the logo was not correct in dark mode and was hard to see, here is some fancy mark down to make the white logo appear in dark mode and the dark logo appear in light mode

Signed-off-by: James Gordon <d12ec30e4a68dc61dfe98c20c3334d632856916c@gmail.com>

estesp/containerd,estesp/containerd,dmcgowan/containerd,mikebrow/containerd,thaJeztah/containerd,containerd/containerd,mikebrow/containerd,containerd/containerd,dmcgowan/containerd,thaJeztah/containerd