ANAHEIM, Calif. — Baby steps. The Mets are banged up and their lineup remains challenged, but a series victory is no small feat for this careening crew, so their weekend in Orange County should be celebrated, albeit cautiously. Mark Vientos provided rare thunder Sunday with two home runs and Clay Holmes’ latest strong performance carried the Mets to a 5-1 victory over the Angels. The Mets won two of three games for only their second series victory since April 5. Before the game the Mets placed Ronny Mauricio on the injured list with a left thumb fracture. Mauricio joined Francisco Lindor, Jorge Polanco, Luis Robert Jr. and Jared Young among the sidelined position players. Vientos’ second homer of the day, a two-run shot in the eighth inning, provided rare breathing room for the bullpen. Luke Weaver pitched 1 ¹/₃ scoreless innings before Brooks Raley recorded the final three outs in a non-save situation.…