Render posts created via Google Docs / ArchieML

[mathisonian]

This adds the following:

• Adds a database migration that adds a new table for posts created in GDocs
• Adds a render method to render posts from this table (including new components and styles for the new post designs)
• Updates the preview server to call this render method when appropriate
• Updates the baker to render static versions of these posts
• Updates the hydrate method to inject the necessary JavaScript for the interactivity in these posts