Dev tools - index deploy script needs to skip pre-built guides

[jenweber]

When we build Algolia search indexes, it looks at what is in public, including our pre-built files, and tries to make indices for those too. We don't want that.

Options:

• The best way to handle this is in Guidemaker - would be good to have a feature where you can just say what version to deploy.
• Add a step to the search index script that deletes the contents of public/v*