Move the Components sample UP one level in the TOC

[guardrex]

Since I just used the Components sample as the demo for the Routing topic on #102, let's move the Components topic sample to a better position in the TOC (up one level) and rename it so that it applies better to any topic in the TOC. We can just run with one sample (for the reference topics only) for a while, which will simplify maintenance of all of the topics during preview. The tutorial will still have its own sample, and it will stay in its current position.

This is low priority work and can be performed at any time. Backlogging it for now.