With the recent popularity of people like Marie Kondo and The Minimalists, people are realizing that maybe they don’t need quite so much stuff. And in fact, they may be happier with a little less.   Now, it’s time to figure out what to do with it all! Where can you turn to give your old things a new life — and make a little cash in the process?   You probably know about Craigslist, but the interface is clunky and it lacks a ...