This reverts commit 97e03104.

Landing on red to hopefully make less red on the board.

TBR=@goderbauer

Unfortunately, device lab does not have the capacity for merge method
rebase. It's essentially DoSing device lab: The last engine rebase has
been processing for 6h now and it is still not done :(

This reverts commit f3a4f7e8.

Accidental merge on red.

This generates a zip file containing all of the docs, and uploads it when we publish docs, as well as a
Dash/Zeal docset that contains a feed of the docs.

Addresses at least part of #9955

Fixes #24158

Fixes flutter/flutter#22062

Upgraded Scaffold example to an application example.