Ayrshire graphic design firm is cashing in on Rangers' charge towards the SPFL Premiership title by selling Steven Gerrard 'smug' face masks.Auld Lang Signs, based in Irvine, began flogging the novelty coverings featuring the Gers boss yesterday after the Ibrox side hammered Ross County 5-0 to go 23 points clear of Celtic at the top of the table.And Bluenoses weren't slow on the uptake with dozens quick to register their interest via the company's Facebook page.One potential customer asked: "Do