gddo-server: enable redirects talks.godoc.org and www.godoc.org

With the move away from nginx, all redirects need to be reimplmented
in gddo-server. This implements the redirect to send talks.godoc.org
to the go-talks App Engine project and www.godoc.org to godoc.org. In
nginx these were 301 redirects. I am making them 302 redirects now
because in the future these redirects are likely to change.

go-talks is just a standard App Engine app. There is no reason we
cannot run go-talks directly from the the talks.godoc.org domain and
likely will in the future.

Change-Id: I4b3e8dda74d31daeba8bd961932f774c6ff1442f
Reviewed-on: https://go-review.googlesource.com/21588
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed