Authentication page needs to be updated to reflect the new Credentials UI

[vsubramani]

The Credentials UI in Google Developers Console has been updated. Some of the things to be updated:

• The nav hierarchy has changed. The phrases are different, but still recognizable with the old hierarchy.
• New credentials wizard has been added to help guide the users to the right credential type.

Please update the Getting Started -> Authentication in gcloud-node to reflect these changes.

[stephenplusplus]

Thanks for bringing this up. I just merged https://github.com/GoogleCloudPlatform/gcloud-common/pull/37, so our site is updated as well.