SAN FRANCISCO – Jason Kidd is back in town, and it’s not for a 30-year reunion of St. Joseph High’s Class of 1992 in Alameda. He is here to coach the Dallas Mavericks past the Warriors in the Western Conference Finals, which begin tonight at Chase Center. “It’s always good to come home,” Kidd said Tuesday. “A lot of great things happened here as a kid growing up in the Bay. It’s always good.” Kidd, 49, was such a teenage phenom that a shrine is on display just 16 miles from the Warriors’ new home, back over the Bay Bridge amid Alameda’s Victorian homes. Take a step inside Kelly Gymnasium, turn…