Clean up docs redirects - 2022-09-29

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/gitlab-docs/-/blob/main/doc/raketasks.md#clean-up-redirects_

Related links

• Related to Docs project maintenance tasks - September 2022 (technical-writing#675 - closed)
• Related to gitlab!99491 (merged) for UI link fixes
• All auto-generated cleanup MRs for this month:
  • Related to gitlab!99282 (merged)
  • Related to omnibus-gitlab!6403 (merged)
  • Related to gitlab-runner!3632 (merged)