cmd: Update deployments to use new proxy/index urls
cmd: Update deployments to use new proxy/index urls

This will enable the proxy sandbox to be turned down.

Change-Id: I97379acfaa8256020562ff9c0824deec07c5f5c1
Reviewed-on: https://team-review.git.corp.google.com/c/golang/discovery/+/454528
Reviewed-by: Andrew Bonventre <682ad9f487f614f19e8b7cc5d340bdc8e1c1b128@google.com>

golang/pkgsite,golang/pkgsite,golang/pkgsite,golang/pkgsite