embeddable button for webmasters to offer a jetzt-reading feature on their page

Just musing: self-contained as jetzt is, we could also provide an embeddable button for webmasters (which essentially is the bookmarklet)
So when you run a page, you could add this a button to speed-read the content and maybe even hint it the main article.

Start by reviewing the existing bookmarklet, which the issue identifies as the basis for this idea. Clarify the embed API, how the main article is selected, and the expected webmaster-facing behavior; the work is done when a self-contained button can be added to a page and trigger the speed-reading feature.

Written by the indexing model from the issue text.