Drop URL segment for component if component name is ROOT
In the discussion for #132, we came to the realization that we could build the term ROOT as it's used for modules by extending it to the component level. In other words, if the name of the component is ROOT, then the component name is dropped from the URL and output path. Effectively, that promotes the component to the site root. It's a simple solution to that basic requirement. We can still explore making this configurable in #132, but doing this much just makes sense.