First draft for an updated Divina level 0

[HadrienGardeur]

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Based on our August 24th call, here's a draft PR for an updated Divina level 0.

Among the changes worth listing:

• readingProgression has been simplified
• the page property has been moved to the core list of value for properties
• a new forceScroll metadata has been added to the Divina profile
• "Presentation Hints" have been renamed to "Divina Presentation Hints"
• simplified "Divina Presentation Hints" to keep the only properties that are still useful