A few unrelated changes:
- Moves configuration to the advanced section and adds words to clarify when it makes sense to use it.
- Renames "Advanced: Pipelines" to "Advanced: Modes, Resources, and Presets".
- Takes out the "Advanced" prefix for the individual section names. They're already under headings that communicate that they're advanced.
- Removes the "Re-use and composition" advanced tutorial section. The reasoning behind this is basically that I don't think we have good recommendations on when to use these features. The examples are also a bit contrived. I don't think it's clear that well-written solids should be reusable. We still have a composite solids concepts section that covers composition.