xpub-journal
xpub-collabra is built for a single journal. As there was no place for a journal in the data model, the journal configuration is passed into the app via this JournalProvider component.
Note:
This will probably need to be replaced by journal configuration in the database, in order to support multiple journals in xpub apps.
To be revisited after we make a more final decision on xpub's data model.