The morning after the night before is usually a time for a sobering reflection after watching Celtic play in the Scottish Premiership. Well, it certainly has been for much of this season but this morning is not that morning. This morning we get to enjoy an emphatic Celtic win that sends a warning to our rivals that we are not out of this title race yet. Not by a long shot. What we saw last night was reminiscent of the Ange Postecoglou years where the wingers were dynamic, the midfield was creative and the strikers were deadly. And one of those wingers was superb last night. Hyunjun Yang has ap…