The downloadable MDM templates referenced sibling files with a `docs/`
prefix that does not exist from the reader's point of view: the files are
served flat under /docs-static/files/, and admins download them
individually. Reference them by plain filename instead, and point the
plist at the public docs URL rather than the .mdx source path.
Also drop two internal-only details that leaked into public templates
(the "Phase 2"/"Phase 5" roadmap markers) and fix netbird-macos.mobileconfig,
which was not well-formed XML: the header comment contained `--`
(`productsign --sign`), which XML 1.0 forbids inside a comment.
riccardom