The README in the root is being updated to let users know that this
website is under development and where they should direct their CLs.
Change-Id: I7355e1103e2ac202061db20b0c55e1cf6b1b95f6
Reviewed-on: https://go-review.googlesource.com/c/156957
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>