Penry Price is not quite “Open to Work” yet, but he announced on Wednesday he is stepping down from his longtime role as vice president of LinkedIn Marketing Solutions. Longtime Twitter veteran Matthew Derella will join the professional network to succeed him.Price revealed his impending departure in a video posted to LinkedIn Wednesday, saying that he will remain in his role through the end of December and stay on in an advisory role through February, followed by “a bunch of downtime” before his next move.Derella had been CEO of artificial…