KhronosGroup
Check copyright header requirements
Right now none of the tutorial files have copyright headers. We need to check if these are required and if so, how they're supposed to look.
Explicit copyrights could be added to the .adoc files but it's not essential. However, I recommend incorporating REUSE in CI. 'reuse lint' verifies that every file in a repo is licensed, and it's straightforward to setup .reuse/dep5 so that specified files are assigned a license without actually needing to incorporate license text in the file itself. Mostly for images and other binary files but it's valid for the markup files as well.
If you want I'll make a PR to this effect - if so, assign it back to me. It looks straightforward since you're using CC-BY-SA on everything in the repo, AFAICT.
