The card is no longer a link itself. The main target is moved to be
the content (the area containing the title and tags). This is in
preparation of upcoming changes: if the whole card is a link, it
cannot contain other links, due to a restriction by html. Later a card
may have more links to provide.
This changes the preview urls to use the concrete attachment ids. This
way browsers have it easier to switch the preview image when the
attachment position is changed.
The scaling factor can be given in the config file. When this changes,
images can be regenerated via POSTing to certain endpoints. It is
possible to regenerate just one attachment preview or all within a
collective.
There is a task to generate preview images per attachment. It can
either add them (if not present yet) or overwrite them (e.g. some
config has changed).
There is a task that selects all attachments without previews and
submits a task to create it. This is submitted on start automatically
to generate previews for all existing attachments.
This is the first available preview of an attachment wrt position. If
all attachments have a preview image, the preview of the first
attachment is returned.
Replaced semantic-ui with the drop-in replacement fomantic-ui [0]
which is a maintained fork. The fomantic-ui used here is a custom
build [1] of the less-version _without_ google-fonts (css-only). The
javascript part of fomantic-ui is not used, and also jquery could be
dropped now.
[0] https://fomantic-ui.com
[1] https://github.com/eikek/fomantic-slim-default
Issue: #349
