Ensure that publication title and issue date is displayed where possible

[eamonnbell-dur]

Where a publication title and an issue date is provided, it should be visible in the search results.

This requires a different approach to each source, so will impact the fetcher code.

It will also require frontend changes.

• ABO: issue date does not appear to be present in the IIIF manifests available from the library (however, since we started on this project, the IIIF Presentation API has been bumped to v3)
• ANNO: issue date is part of original source filename in YYYYDDMM format, so this is just rewritten to ISO YYYY-DD-MM for clarity
• MDZ: issue date is available as a string which acts as a "section" divider between IIIF sequences of canvases, this can be extracted from the manifest

[eamonnbell-dur]

Full publication title information was already available in the database at title_full
1a6879d adds support in the backend for:

• a more uniform approach to presenting page numbers
• dates for sources, where possible as a string date

Where issue date information is not available in the fetched data, "n.d." is returned instead.

[eamonnbell-dur]

9439a9e introduces a minimal change to the frontend to show the full title, date, and page number