Remove rights section when editing #7716

This commit removes the rights section while creating or
editing either archival descriptions or accessions. From now
on, the user will create rights separately via the
"More" -> "Create new rights" button. And can edit existing
rights by clicking 'edit' when viewing archival descriptions.

Also added is the "More" -> "Create new rights" button for
accessions, which wasn't there previously.

Style fix