Comment out Install Guides Section
Comment out Install Guides Section

Removes install guides section which is targetted for Juno release. Current
install guide section starts with prefix lab* is still intact.

Change-Id: If90280cd2a0ffaa7450e863761c31f5f7a0c258d

harrisonfeng/training-guides,openstack/training-guides,Nabs007/training-guides,Nabs007/training-guides,Nabs007/training-guides,openstack/training-guides,harrisonfeng/training-guides,harrisonfeng/training-guides