Now, that the first pieces of the Block content areas based themes are in place. We'll need to build a demo theme with demo content to iterate on the Full Site Editing work.

This will be used as demo content for the Full Site Editing work, the same way, we have a demo post content to help us iterate on the editor. It should also evolve with the relevant iterations.

It could be enabled automatically once we enable the "Full site editing" flag on the Gutenberg plugin.