copy all root files over to root of public folder (#7606)
copy all root files over to root of public folder (#7606)

* copy all root files over to root of public folder

* fix linting error
istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io