The first week of playoff football is in the books and 15 area teams are headed into the second round. Here’s a first look at this week’s matchups. 6ARigby comes off a bye and will host North No. 2 seed Post Falls on Friday at 7 p.m. Post Falls (7-3) is the second-place team out of the Inland Empire League behind Coeur d’Alene and is one of the highest scoring teams in the division at 30.4 points. The Trojans put up 49 points in last week’s win over Borah. Rigby (8-1) has won eight straight since a season-opening loss at Coeur d’Alene and has scored 105 points over its past two games. Madison …