To use this repository you need to install the base netboot.xyz image, a Keybase account and the Keybase client.
If you just want to boot your iPXE-enabled system using one of the utilities in the menu, you need only navigate to an iPXE shell prompt and issue this command:
chain --autofree https://raw.githubusercontent.com/RogueScholar/netboot.xyz-custom/master/custom.ipxe