Update the "Edit this website locally" link on the "Using GitLab at GitLab" page.
This makes the "Edit this website locally" link URL at https://about.gitlab.com/handbook/using-gitlab-at-gitlab/#relevant-links relative to the site root.
This makes the "Edit this website locally" link URL at https://about.gitlab.com/handbook/using-gitlab-at-gitlab/#relevant-links relative to the site root.