Convert All-Remote Marketing Handbook page to Strategy and Operations Workplace page

To mark the formation of the Strategy and Operations (Workplace) team on GitLab's CoST, this merge request updates the outgoing All-Remote Marketing page to reflect the new structure.

It also:

1. Renames the page
2. Moves the page from Marketing to Chief of Staff (folder structure)
3. Clarifies the addition of MECC/management philosophy alongside existing all-remote infrastructure content

Once merged, I'll create a redirect issue to redirect the old URL (https://about.gitlab.com/handbook/marketing/corporate-marketing/all-remote/) to the new URL (https://about.gitlab.com/handbook/ceo/chief-of-staff-team/workplace/)

UPDATE: URL Redirect Issue

Author Checklist

• Provided a concise title for this Merge Request (MR)
• Added a description to this MR explaining the reasons for the proposed change, per say why, not just what
  • Copy/paste the Slack conversation to document it for later, or upload screenshots. Verify that no confidential data is added.
• Assign reviewers for this MR to the correct Directly Responsible Individual/s (DRI)
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the Maintained by section on the page being edited
  • 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 affect team members, or warrant an announcement in another way, please consider posting an update in #whats-happening-at-gitlab linking to this MR
  • If this is a change that directly impacts the majority of global team members, it should be a candidate for #company-fyi. Please work with internal communications and check the handbook for examples.

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