Test WebPublication

Related schemas: https://wikisphere.org/wiki/Special:PrefixIndex?prefix=&namespace=2300

docs:

• https://readium.org/guided-navigation/roles.html
• https://readium.org/webpub-manifest/#11-goals
• https://github.com/readium/webpub-manifest/tree/master
• https://github.com/w3c/epub-specs/blob/main/epub33/explainers/EPUB33-explainer.md
• https://github.com/w3c/epub-specs/tree/main
• https://drafts.opds.io/opds-2.0