Rejoice: After the NBA’s self-imposed weeklong layoff, the Boston Celtics and Dallas Mavericks are finally ready to tip off the NBA Finals.A (hopefully) seven-game showdown pitting Jayson Tatum and Jaylen Brown against Luka Doncic and Kyrie Irving is red meat for the sports betting public.Every journey starts with a single step, so let’s focus on Game 1 today. Here are three bets worth considering for Thursday night’s series opener.Boston Celtics to cover -6.5 (-110 at BetMGM, FanDuel)This one doesn’t require much overthinking. We’ve been treated to an abundance of close playoff games in recent weeks — well, at least out of the West — but the Celtics are favored at -225 to win this series for a reason. They’re the better team top to bottom, they were hardly tested throughout…