The Capitals re-signed Trevor van Riemsdyk to a three-year extension, Washington general manager Brian MacLellan announced Saturday. The Athletic’s instant analysis: Capitals’ blue line taking shape Less than two weeks after trading for Rasmus Sandin and re-signing Nick Jensen, the Capitals’ 2023-24 blue line continues to take shape. With the versatile and reliable van Riemsdyk back in the fold, Washington …