By Joseph Salvador He hasn’t appeared in a game all season and is recovering from a herniated disc in his back. Nets coach Steve Nash announced Monday that Ben Simmons will not play for the rest of the regular season or the play-in tournament. Simmons has not appeared in a game this season as he continues to deal with a herniated disc in his back. Simmons was traded from the 76ers in a blockbuster deal back in February, but he hasn’t suited up once. The Nets, meanwhile, will have to play in the play-in tournament as their defensive woes continue—something Simmons was expected to improve. The 2…