Old Arch only documentation should be moved into their own section in the sidebar

[jonthysell]

Suggestion

When every page is tagged as per #1014, we should put ever Old-Arch Only pages into their own sidebar section

Location

No response

[anupriya13]

Check this PR: #1024

Working on adding all other components:

[jonthysell]

For the main pages, while we may move pages in or out of the sidebar, I think with the pages properly tagged at the top we no longer need to hardline move all the old arch pages into their own sidebar section.

For the API docs it may make more sense to call them out, but again I think the tagging helps a lot here.