Sending ManualChangeHistory to Panopticon

- added a manual change notes artefact formatter
- find mappings for Panopticon by slug
- add the formatter to the wiring
- add a test for sending the change notes to Panopticon
- remove PublicationLog for Manual, as we only care about the Documents
I think we should inherit from `ManualArtefactFormatter` here and just override `slug` and `kind` (`state` should be draft if the manual is)