cmd/googlegolangorg: make google.golang.org a separate service

The version cleaner deleted the very old version of golang.org
named "google", as it was designed to do. Make google.golang.org
its own service instead of a precarious version.

Already deployed, to bring back google.golang.org.

Change-Id: Ia3e63a93d8b613e9cc7f7d241d9187d9422cf6ba
Reviewed-on: https://go-review.googlesource.com/c/website/+/328689
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

cmd/googlegolangorg/README.md

@@ -14,5 +14,5 @@ See `go help importpath` for the mechanics.
 To update the public site, run:
 
 ```
-gcloud app --account=username@domain.com --project=golang-org deploy --no-promote -v google app.yaml
+gcloud app --project=golang-org deploy --promote app.yaml
 ```

cmd/googlegolangorg/app.yaml

@@ -1 +1,2 @@
+service: google
 runtime: go112