August – hell, isn’t it? Season of smug Instagram beach photos and out-of-office email replies. The month when everyone else is on holiday and you’re stuck behind a desk. But rest assured, it’s not all existential bleakness, picking up other people’s slack and dealing with dodgy air-conditioning. In fact, August can be the best month to get ahead at work. Why? Because while all your colleagues are reading The Girl on the Train on a…