2022-June-18 - Prerelease - 2.6.934

Docs: Update & Prune admin docs (#10696)

- Remove a good bit of out of date content. For example, 'freewarefiles.com'
no longer exists as a website.

- Simplify docs and remove redundant content, map-maintenance for example
has largely duplicative content compared to the 'admin-scripts' repository
that is in the maps org.