Custom Extension: Spotlight

[Mischback]

The category overview pages should provide a spotlight, a box with images linking to selected articles.

Functional Requirements

• selection of spotlights from within the category's index.rst document
  • in file's meta fields
  • in file's body
• requires:
  • image source file
  • caption / title
  • link target document
• image source file must be included in the build
  • added to the document's dependencies
  • marked to be copied to .build
  • tbc

Dependencies

• Responsive Image Extension doesn't work for an image included in two different documents #120