Clean up docs redirects - 2025-05-09

Monthly cleanup of docs redirects.

See https://about.gitlab.com/handbook/product/ux/technical-writing/#regularly-scheduled-tasks

Created automatically: https://gitlab.com/gitlab-org/technical-writing/docs-gitlab-com/-/blob/main/doc/tasks.md#expired-redirects

Related to team-tasks#1325 (closed)