Work around Hugo bug with GitHub last modification times. (#2206)
Work around Hugo bug with GitHub last modification times. (#2206)

Hugo is unable to report accurate GitHub information for a certain
percentage of our files. Instead of displayed a last mod time of
"January 1, 0001" we omit display a last modification date at all.
https://github.com/gohugoio/hugo/issues/5054
istio/istio.io,linsun/istio.github.io,istio/istio.io,geeknoid/istio.github.io,geeknoid/istio.github.io,linsun/istio.github.io,linsun/istio.github.io,geeknoid/istio.github.io,istio/istio.io,geeknoid/istio.github.io,geeknoid/istio.github.io,linsun/istio.github.io,istio/istio.io,linsun/istio.github.io,istio/istio.io,istio/istio.io,istio/istio.io