FIX: modal for field edition now display scrollbar correctly

• Trello card Field edition dialog can now either save or cancel edition
• Trello card Share & export tab on resource page
• Trello card Public dataset page ergonomics (with ontology & export)

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Ontology tab in resource page

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Resource page ergonomics

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Allow to export a single resource

• Trello card Admin ergonomics
• Trello card Documentation about config + better development environment
• Fix: facets applied on columns with a name containing a +

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Fix preview column size in field edition dialog (see #152)

Fixes:

• pagination on frontend
• fix total items count on frontend

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Sort dataset on public page

• Fix React warnings on Dataset
• Fix model export
• Allow free values in scheme