Update Mac download

[limdingwen]

Here is a community build for Neverball. Neverputt is there too. Neverball/neverball#151 (comment)

[Calinou]

This would be addressed by #19, although MacPorts might be considered too involved to install for casual users who just want to get Neverball running. It's good to provide as an alternative still.

It may be worth contacting Mac Source Ports's owner (see the bottom of the FAQ) about this too, as they have lots of experience creating signed and notarized builds of open source games.