Miscellaneous annual files on document page

One-sentence description

The ability to add more yearly files on the document page.

Motivation

Normally things like the half year report are added as GM documents, but now we want to add yearly documents that are not necessarily discussed at a GM. We want to add a report from the societies on how well everything worked that year, as the society rules state that they should publish this.

Desired functionality

A new section underneath the GMs, where miscellaneous or other documents can be added.

Suggested implementation

See picture in the comments.