Allow managers upload reference_docs

Rationale / Begründung

Funders expect exported DMP to be conform to their own templates - including font, colours, pictures, table width, headlines, titlepages, etc.

All these details are lost upon the conversion with Pandoc, but they may partly be recovered using Pandoc's optional argument --reference-doc followed by a ODT or DOCX document name.

At the moment, only instance admins can set this option into the code and upload or replace the reference docs.

Affected

Managers

Minimal functionality

It would be highly desirable to have an upload button and a checkbox to allow managers upload directly the documents, to perform rapid checks during catalogue development.

Nice-to-have functionality

In addition, it might be useful to allow upload of other accessory files, such as images appearing in the exported views.

References / Verweise

• https://pandoc.org/MANUAL.html#option--reference-doc

Start by locating the existing instance-admin configuration and upload or replacement path for Pandoc reference documents, then compare its permissions with the manager role. Done means managers can upload or replace ODT/DOCX reference documents through the interface and use a checkbox to control them, with the current Pandoc export behavior preserved.