Shell said on Friday it had restarted production at its offshore Mars and Ursa in the Gulf of Mexico and began exporting oil and gas through a transfer facility, which was shut due to damage from Hurricane Ida.The oil major was the hardest-hit producer from Ida, which tore through the Gulf of Mexico in August and removed 28 million barrels from the market.Shell's West Delta-143 offshore facility, which transfers oil and gas from three major fields for processing at onshore terminals…