ATHENS/FRANKFURT (Reuters) – Greece’s outspoken finance minister resigned on Monday, removing a major obstacle to any deal to keep Athens in the euro zone after Greeks voted resoundingly to back the government in rejecting the austerity terms of a bailout. Yanis Varoufakis, a self-proclaimed “erratic Marxist” economist who infuriated euro zone partners with his unconventional style and hectoring lectures, had campaigned for Sunday’s sweeping ‘No’ vote, accusing Greece’ creditors of “terrorism”.