[muyuu]

Also, not a great idea to rely on some "cloud" 3rd party service to host your portfolio IMO - at least not exclusively. Maybe I'm old-fashioned.

That said, I don't think anyone will bin a candidate because Github didn't highlight his or her code properly.

[regularfry]

It's not that people necessarily choose to host portfolios on github, but more that employers will treat whatever's on there under your name as a portfolio regardless.