Export markdown file containing all papers + links

[koppor]

JabRef can export any files (see https://docs.jabref.org/collaborative-work/export/customexports). - Refs: #392

Since static page generators on Markdown are en-vogue, JabRef should offer a built-in Markdown export.

Example rendering: https://ozimmer.ch/papers/

Derived requirements:

• Top lists the 5 last publications
• Group by type
  • Subgroup

A JabRef "magic gropu" should be generated. It has to be created manually by the user and called "Export". The subgroups of this group are used to group the paper. The titles are the group description.

Each paper should have a link to the PDF.

In case there is an doi/url, link that from the the title.

I think the rendering for each entry has to be made using the .layout files. (Because using the current preview style does not help to a) link the doi in the title and b) have the PDF linked)