EAST RUTHERFORD, N.J. — Fire everybody. Well, everybody except Big Dom. At least he showed some fight this season. Nick Sirianni’s overpaid underperformers entered MetLife Stadium on Sunday to face a hopeless team playing for nothing but draft picks and pride. The Giants fell a few draft slots but won the game, 27-10, over an unmotivated, unprepared, unfocused flock of Birds, and laid things bare: This Eagles coaching staff is overmatched. By everybody. Sirianni won’t get fired — he’s made the playoffs in his first three seasons as a head coach and nearly won the Super Bowl last year — but nob…
