As a content editor, I want transcription edits displayed immediately on the document details so that changes and new content are all available to all site users.

[rlskoeser]

testing notes

• use the transcription editor to make a change to the transcription; load the public document details page and confirm that the change is visible

dev notes

update public transcription display to pull content from annotation server

If we were working with an external annotation server, we would want to query the search endpoint by manifest but I think it will be significantly faster to use the queryset.

• revise digital edition footnote html content method to return a dict keyed on canvas uris (adapt sync transcription logic; must handle placeholder canvases for documents without images)
• revise transcription panel output to output transcriptions based on canvas uri instead of index and sectioned out by scholarship record, when there are multiple (already complete)