Change the way we deal with data

[ia3andy]

Due to an issue with Qute, I had to change the way we deal with data.

From now on, data is available under site.data or page.data.

Some shortcut methods allow to access specific data from site or page:

• url (the page url as a RoqUrl)
• img (the image url as a RoqUrl)
• title
• description

for NormalPage, we can access paginator (if defined) for DocumentPage, we can also access the collection and the date

This PR also change a bit the way we deal with url making it simpler and more consistant, allowing to call absolute or relative at the end.

[ia3andy]

Yeah me too, it's more type-safe and consistant. I was stuck on keeping it similar to Jekyll

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