A Deliveroo rider near Victoria station in London, England, on March 31, 2021.Dan Kitwood | Getty ImagesLONDON — British food delivery firm Deliveroo on Monday said it has agreed to a takeover offer from American rival DoorDash that values the company at £2.9 billion ($3.9 billion).Deliveroo, which lets users order hot meals and groceries via an app, said its board agreed to an offer from DoorDash to acquire all issued and to be issued shares in the company for 180 pence a share.That marks a 44%...