The site asciidoc3.org was updated: broken links, minor text rearrangements et al.

You can find the "tests" from now on at https://gitlab.com/asciidoc3/asciidoc3-tests

(GitLab, not GitHub!) - still work in process.

The asciidoc3-repo stays as before: https://github.com/asciidoc3/asciidoc3