Merge the "biking style" term list in user registration with the bicycle container

I created a 'bicycle' container thinking that certain content would have to do with certain types of bikes.

Meanwhile, there's a 'biking style' section on the user registration form that has a lot of the same terms.

Let's find a way to merge them, so that when someone clicks a biking style like "commuting" they'll see Rock the Bike members interested in commuting, AND content that has to do with commuter bicycles.