Support referencing attachments across components/modules
Antora presently doesn't allow content in the
attachments directory to be used across multiple modules or separate components.
attachments is used to include resources for the user to download in a module (e.g. images, zip files etc. (see docs)
This would be helpful in the following illustrative (hopefully non-controversial) use cases:
- Allowing a separate "Downloads" page with references to all attachments in a project/site/component (i.e. not being restricted by the site navigation and repository layout)
- Allowing a separation between documentation text and other artifacts (e.g. for git-lfs support) which might be large/heavy for a documentation repository
(See #180 for more discussion about this general idea)