Complete transition from Confluence to GitHub issues

[robrap]

There are many issues noted in https://openedx.atlassian.net/wiki/spaces/AC/pages/2554331530/Toggles+and+Settings+Documentation. The higher priority issues have already been migrated to GitHub.

Additional Notes:

• Ideally the page could be archived once this is complete.
• As of 2023-06-24, the issues are not yet on a Project, so the priorities in the doc (for the already migrated tasks) are not yet in represented in GitHub. It would be great if that information could be handled somehow.
• The notes that haven't yet been migrated to GitHub may be lower priority, and should either be ice-boxed (deleted/archived?) or moved to GitHub. They will need to be reviewed bullet by bullet.

[robrap]

As noted above, I also want to be able to capture prioritization of some toggle issues that were in the doc.

Possible ideas:

• Add a new edx project or openedx project.
• Add to the existing Arch-BOM project (as maintainers) in a way that is filtered out of certain views.
• Simply move [High], [Med], etc. to ticket headers.
• Add some prioritization labels.

This relates to arch-bom backlog item edx/edx-arch-experiments#291, but at this point, I don't want to prioritize against other arch-bom work (at this point), but just across the repo itself.

[robrap]

[idea] Could capture on this issue (or a permanent issue) as a sorted task list on the issue.