copy files/*.html verbatim (skip filters)

Use case: Google site verification.

And besides, verbatim copying is generally what a person putting .html
files in there would want (why not make them stories if that’s not the case?)

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
Merge pull request #1358 from getnikola/verbatim-html-files

copy files/*.html verbatim (skip filters)