Etsy, the online marketplace where creative entrepreneurs can set up storefronts to sell their own products, launched in 2005 with the goal of creating an online retail space that would build a more fulfilling and lasting world. So it’s no surprise that its newest 200,000-square-foot headquarters in the Dumbo neighborhood of Brooklyn would be filled with toxin-free paint, salvaged wood, and furnishings purchased from Etsy sellers.