tour: serve from cmd/golangorg as go.dev/tour

tour.golang.org is the last independent server in this repository
and almost the last golang.org domain with user-facing content.
(talks.golang.org remains.)

We need to keep golang.org/x/website/tour as a runnable binary,
but move the logic into internal/tour so it can be used from both
the tour binary and cmd/golangorg.

After this is deployed, we will need to delete the current tour app
from the golang-org project, and then requests for tour.golang.org
will default to the main server (cmd/golangorg).

This will make the tour available in China for the first time,
at golang.google.cn/tour.

Change-Id: I0f025d8ae89e12489d26bb3bc380a833eeb57bcc
Reviewed-on: https://go-review.googlesource.com/c/website/+/365100
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Jamal Carvalho <jamal@golang.org>

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