Add Frank while I'm out (#1499)
Add Frank while I'm out (#1499)

I'm traveling from now till mid July.  Frank is one of the top 5 contributors to the istio.io, could I add Frank to cover me for doc maintenance while I'm out?
istio/istio.io,istio/istio.io,linsun/istio.github.io,istio/istio.io,istio/istio.io,geeknoid/istio.github.io,istio/istio.io,geeknoid/istio.github.io,geeknoid/istio.github.io,istio/istio.io,linsun/istio.github.io,geeknoid/istio.github.io,linsun/istio.github.io,istio/istio.io,linsun/istio.github.io,geeknoid/istio.github.io,linsun/istio.github.io