landing page updates
landing page updates

Change-Id: Idf5659ba9a8ac24a921cdfb9aabafbbb7ac78395

GoogleCloudPlatform/tensorflow-without-a-phd,GoogleCloudPlatform/tensorflow-without-a-phd,GoogleCloudPlatform/tensorflow-without-a-phd,GoogleCloudPlatform/tensorflow-without-a-phd