docker image to run website linters (#1518)
docker image to run website linters (#1518)

* wip: docker image to run website linters

docker build -t gcr.io/istio-io/website-builder:v0 .
gcloud docker -- push gcr.io/istio-io/website-builder:v0

* add hugo

linsun/istio.github.io,istio/istio.io,istio/istio.io,istio/istio.io,geeknoid/istio.github.io,linsun/istio.github.io,linsun/istio.github.io,istio/istio.io,istio/istio.io,istio/istio.io,linsun/istio.github.io,geeknoid/istio.github.io,istio/istio.io,linsun/istio.github.io,geeknoid/istio.github.io,geeknoid/istio.github.io,geeknoid/istio.github.io