One word: Whoa. A wise reader of these ramblings recently stumbled onto a discovery that still has me doing a double-take. It’s a seemingly secret website that lets you watch any YouTube video ad-free anytime—without paying a dime. It sounds too good to be true, I know—but get this: It’s actually an official Google-owned website. It just isn’t designed for public knowledge or meant to be used in quite this way, by regular ol’ YouTube-watchin’ sc…