apps to include in the demo: * [x] directly calling `Bookmark.getAll(fetcher, webId)` * [x] https://github.com/mark-book/markbook * [x] https://bookmarks.pondersource.net/bookmarks * [x] https://vincenttunru.gitlab.io/poddit/ * [x] https://jeff-zucker.github.io/linked-bookmarks/ * [x] https://scenaristeur.github.io/booklice/ * [ ] https://rrustom.github.io/solid-rss/
