Site Update and GitLab

Published: 2018-06-17
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

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