Updates the archive generation to support the new folder structure: archives/<digest-slug>/<date>.html. Changes: - Updated 'OverviewTemplateData' to include 'DigestTitle' and 'DigestSlug'. - Updated 'ArchiveService' to use 'DigestSlug' in file paths. - Updated 'DigestService', 'View', and 'Processor' to propagate digest title/slug. - Updated tests to match new structure and signatures.