kijiproject.github.com: 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.
commit: https://github.com/kijiproject/kijiproject.github.com/commit/17cdd02bd649b8a330edf5f3c3864ff9a7e5f4aa