Fix release script for scoring.

Fix broken link in tutorials.md.

Remove incorrectly-generated _config.yml files in subdirectories
and merge them into the top-level _config.yml file.

Modify the release-docs.sh script to use the right _config.yml file throughout.
Modify the release-docs.sh script to correctly release scoring userguide & tutorial.

Remove incorrectly-generated scoring 0.9.0 tutorial & userguide.
Regenerate scoring 0.9.0 documentation.