dgt authored Dec 19, 2018 and azul committed Aug 31, 2019

archive creation requires the same permissions as group destruction.
users can either create an archive directly or issue a request.

archives contain pages owned by a group and all committees. they include
- a table of contents
- wiki pages as HTML with linked attachments and discussions,
- discussion pages
- gallery pages
- assets from asset pages

archives come in two flavours:
- a single page per group for all content
- one file per page

archives can be downloaded by all members who see the settings (group
admins)
councils can be exported from the council settings page and are only
accessible for council members

archives are created asynchronously via rake jobs:work

Not working yet: links to pages with id suffix