By Toby Sterling AMSTERDAM (Reuters) -Just Eat Takeaway.com NV announced the departure of its chairman and an investigation into another senior executive, hours before facing shareholder criticism at a fiery annual meeting on Wednesday. Supervisory Chairman Adriaan Nuehn, whose position had been under pressure, would not seek reappointment, Europe’s largest online meal delivery firm said prior to the meeting. Separately, long-time Chief Operating Officer Joerg Gerbig was under investigation for “possible personal misconduct at a company event” and would be leaving the management board at least…