Added Theseus to supported viewers for recipe 0229

[stephenwf]

Shown when hovering over the ranges at the bottom.

https://theseusviewer.org/?iiif-content=https%3A%2F%2Fiiif.io%2Fapi%2Fcookbook%2Frecipe%2F0229-behavior-ranges%2Fmanifest.json

[triplingual]

Love it! Though I'm not sure about those thumbnail sizes. The manifest has them as 1266h x 2250w, but in the preview they are definitely taller than wide.

[stephenwf]

Oh, how are they appearing? For me they are showing up like in the screenshot with the same aspect ratio as the image. Maybe it's only in a specific browser?

[triplingual]

(All Mac Sequoia)

Chrome and Firefox:

Safari:

[stephenwf]

Thanks @triplingual! I'll look into that bug