Refactor namespaces documents to match the structure of the W3C ns repo

[palemieux]

See structure at https://github.com/w3c/ns/tree/main/ttml/profile

In preparation to address #640

[nigelmegitt]

Looks good to me, thanks for the refactor effort @palemieux .

[himorin]

sorry for late catch, but we also need to update .github/workflows/auto-publish.yml for directory structure change...

[nigelmegitt]

sorry for late catch, but we also need to update .github/workflows/auto-publish.yml for directory structure change...

What change is needed? These files are not auto published, and they're not in paths in auto-publish.yml, and merging this pull request did not cause a date change on the CRD, which currently shows 26 February 2026, so I think no change is needed, but maybe I missed something.

[himorin]

sorry for late catch, but we also need to update .github/workflows/auto-publish.yml for directory structure change...

What change is needed? These files are not auto published, and they're not in paths in auto-publish.yml, and merging this pull request did not cause a date change on the CRD, which currently shows 26 February 2026, so I think no change is needed, but maybe I missed something.

ah, quite sorry that I've mixed up with https://www.w3.org/TR/2025/CR-ttml-imsc1.3-20251218/xml-schemas/ , and these files (now under) /ns/ are not published...