Document Maps, IIIF Interactions and IIIF Georeference Extension + OSD Annotations

[DiegoPino]

What?

Documentation for:

• OSD Annotation Widgets and API is needed + new Georeference Widget
• New Leaflet Map Formatter options and Proper IIIF Manifest/Twig usage for Georeference Annotations
• Mirador + Maps Event Driven (JS) interactions. How do they work and what to expect from there

[DiegoPino]

See https://github.com/esmero/format_strawberryfield/pull/303