Link to IIIF manifest for items, collections, and maybe search results

[escowles]

Summary or User Story

User Story from Ben Johnston: As an instructor wanting to reuse content, I would like to have a link to the IIIF manifest for items and collections I've viewing. That lets me easily bring the content over into Canvas to share with a class.

I think the same logic applies to search results: if I do a search and like the set of results, having a IIIF manifest view of it would make it easy for me to reuse that set of resources.

Acceptance Criteria

This section can be completed by the DLS team. Some requirements to consider
including:

• The UI implemented for this issue meets accessibility requirements
• New functionality is documented

First step

This section can be completed by the DLS team