make-doc: add an 'assets' make target for the doc
used by the swh-docs to generate images and schemas when building the whole documentation.
Depends D649
Migrated from D652 (view on Phabricator)
Staging instance, all changes can be removed at any time
used by the swh-docs to generate images and schemas when building the whole documentation.
Depends D649
Migrated from D652 (view on Phabricator)