Not mensa-specific

The dev sprint found out that this app is not specific to mensae, so:

• Conclude that this app managed time-based documents

• Reword all parts of the app so this is reflected
• Restructure the data model, e.g. like so:
  • DocumentGroup defines a set of documents that have a certain validity/schedule
  • Document defines one uploaded file in this group
• Find a new name that represents that → Resint
• Implement permissions

changed due date to March 29, 2020

added workflow::confirmed label

assigned to @fph and unassigned @hansegucker

created merge request !14 (merged) to address this issue

mentioned in merge request !14 (merged)

assigned to @hansegucker and unassigned @fph

changed the description

marked the checklist item Implement permissions as completed

closed with commit f75031e3