Just as Uber gives nearly anyone with a car a chance to become a driver for a hire, a new local startup aims to give those with spare time a chance to make a buck by being a helpful neighbor. Naborforce launched last month in Shockoe Bottom to connect aging Richmonders to its network of helpers, or “nabors,” who provide on-demand assistance with non-medical tasks such as errands, transportation, help around the home and social engagement.