Moving the GitLab People Policy Directory & other code of conduct headings to the people group page.

Why is this change being made?

As per this request - https://gitlab.com/gitlab-com/people-group/General/-/issues/783#note_385247834

I have moved the GitLab People Policy directory and its contents to the main people group handbook page. I have also moved the below element of the code of conduct and added them to the People Policy directory.

| Commitment to Non-Retaliation | | Open Door Policy | | Discrimination | | Harassment | | Fair Wages | | Substance Abuse | | Employee Information Privacy |

Author Checklist

• Correct MR template applied (e.g blog post)
• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
• Assign this change to the correct DRI
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to your manager.
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies.
  • If the changes relate to any part of the project other than updates to content and/or data files please make sure to ping @gl-static-site-editor in a comment for a review and merge. For example changes to .gitlab-ci.yml, JavaScript/CSS/Ruby code or the layout files.

For help with failing pipelines reach out in #mr-buddies in Slack