Migrate the Office Hours topic list into the Learn GitHub

[rfluethi]

Description

This issue was discussed in the Office Hours session on June 27, 2026.
Move the Office Hours topic list from the personal project board into the WordPress/Learn repository so it is public and team-owned.

Tasks

• Decide the storage form (issues with a label, a project board, or a Discussions category)
• Migrate the existing entries from github.com/users/rfluethi/projects/10 without losing context
• Document how contributors add and review new topics
• Link the new location from the Office Hours recaps and the handbook

Context

The topic list currently lives on a personal project board, which is a single-maintainer dependency. Discussed in the June 27 Office Hours (#14).