Change tutorial name to `Tutorial-SciBmad`?

Since this tutorial is expanding to include more than ring design, perhaps changing the name to simply `Tutorial-SciBmad` is appropriate.

The issue proposes renaming the tutorial from its current ring-design name to Tutorial-SciBmad, but it names no files, tests, or entry points. First review the repository name and tutorial-facing references, then confirm the scope of any links or metadata that would need to match. Done means the proposed name is resolved and the repository’s affected naming references are consistent.

Written by the indexing model from the issue text.