Reorganize codeowners and move some file
- Updates the handbook group to the content-sites group.
- Cleanup of codeowners file, and re-organizes it:
- Remove team members who are no longer at GitLab
- Sorts sections alphabetically except handbook related ones, and controlled documents, which are at the bottom.
- Updates the comment at the top to clarify, and remove redundant comments.
- Sorts list of pages/directories in a section alphabetically.
- Combine some sections that were duplicated, or only had 1-2 lines.
- Ensures all top-level pages and directories are listed.
- No changes to codeowners themselves, except adds e-group to handbook stuff, and makes support directory optional (leaves specific pages required).
- A few pages were moved to directories where it made sense. Redirects (aliases) added in these cases.
- A few pages were deleted where obsolete or empty.
Related to https://gitlab.com/gitlab-com/content-sites/handbook/-/issues/173
Edited by Cynthia "Arty" Ng