This section has a relative link to
[Key management Guidelines](key_management.md)
as is appropriate : https://github.blog/2016-12-05-relative-links-for-github-pages/
As the GitHub pages for this site are hosted at https://mozilla.github.io/infosec.mozilla.org but are fronted by an AWS CloudFront CDN in the infosec-prod AWS account, when this link is rendered it's done as
https://infosec.mozilla.org/infosec.mozilla.org/guidelines/key_management.html
Which 404s
Figure out how @gdestuynder envisioned this working and if changes need be made in CloudFront, or in all relative links, or something else.