Development of EtherBoot gPXE was always development
of iPXE core developer Michael Brown.

http://git.etherboot.org/?p=gpxe.git was last updated in 2011
https://git.ipxe.org/ipxe.git is well alive

This  s/gPXE/iPXE/ reflects that.
Signed-off-by: Geert Stappers <stappers@stappers.nl>