By Matt Audilet Kurt Busch announced a major career decision on Saturday morning. The NASCAR legend revealed that he’s shutting down for the remainder of the season and will not compete for the Cup Series championship in 2023. Busch revealed his plans from his hometown track of Las Vegas Motor Speedway, the home of this weekend’s South Point 400. Here’s his full announcement on Twitter: Busch has missed the last 12 Cup Series races after suffering a concussion in a qualifying wreck at Ponoco Speedway on July 23. Despite hope that he could return sometime this season, he’ll now miss the last fo…