Add link to community drive for design docs (#597)
Add link to community drive for design docs (#597)

Get folks to join the drive rather than requesting access for each doc. :/

Former-commit-id: 1d388317bff0aed412c79c8968e8365e296b07db
sebastienvas/istio,geeknoid/istio,sebastienvas/istio,geeknoid/istio,smawson/istio,mandarjog/istio,mandarjog/istio,smawson/istio,istio/istio,geeknoid/istio,geeknoid/istio,sebastienvas/istio,frankbu/istio,smawson/istio,mandarjog/istio,geeknoid/istio,istio/istio,smawson/istio,mandarjog/istio,frankbu/istio,istio/istio,sebastienvas/istio,frankbu/istio,smawson/istio,frankbu/istio,smawson/istio,istio/istio,mandarjog/istio,sebastienvas/istio,frankbu/istio,geeknoid/istio,istio/istio,frankbu/istio