Revert "TOOLDOC-310 add missing 4.0.0.Final/index.html and fix 4.0.1.Final/index.html"

This reverts commit bdfdb7932c2a18595687a4be54e7269fe30170a7.
Revert "add refactored index page for ancient XulRunner thing from JBT 2.0; replace latest/index.html w/ a symlink; symlink archive folder as OLD; add nightly-docs folder to .gitignore; clean up index.html"

This reverts commit 919a574c88f934476cebb00fec2ec8a8daeac8c5.