Tupelo seems to include the images the README uses under resources, putting extra files into the jar file. Even more surprising is that when using a web server for serving static files from the very common path "resources/public", tupelo includes the whole re-frame todomvc example, including the index.html file which will be served then.
This issue appears to be discussing a feature request or bug report related to the repository. Based on the content, it seems to be resolved. The issue was opened by hukka and has received 5 comments.