[cv] Add feedback link to every page.
[cv] Add feedback link to every page.

R=yiwzhang,tandrii

Bug: 1246072
Change-Id: Ia82524eaf71d4a5ca146b933748ed9c14f247491
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/3152495
Reviewed-by: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@google.com>
Commit-Queue: Roberto Carrillo <b31161e510fbb37f8f70fdcde11530d2bae88470@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go