Update the netboot.xyz example gif

[antonym]

Update the netboot.xyz example gif. It's outdated and there has been a lot of new options added since original creation.

Quickly demonstrate the capabilities of netboot.xyz in a short, small animated gif to replace the one here:

https://github.com/netbootxyz/netboot.xyz-docs/blob/master/static/img/netboot.xyz.gif