Just days after Angelina Jolie and Brad Pitt’s son Pax, 20, was involved in an e-bike accident in California, he is on the mend — slowly but surely. “Pax has been released from the ICU. He suffered complex trauma, and now begins the long road of recovery and physical therapy,” a source dished to a news outlet. According to the insider, Pax’s mother, who was his side the whole time in the hospital, “are deeply grateful for the quick and life-saving action of first responders, and the outstanding medical care he received.” Jolie, 49, and his siblings have been “visiting and helping” throughout t…