Revert r46484, r46485, r46511, r46512:
The claim that there were no "substantive" commits to this article are made without any knowledge of internals of re@. Several parts of the removed content is still relevant for 8.x, which we do still support. Furthermore, this particular article, outdated or not, falls under RE territory, and these drive-by commits were not approved.
Approved by: re (implicit)