Merge "docs: change preview landing page top ribbon color" into mnc-io-docs am: a138ad92b2
am: 3357a67905

* commit '3357a67905453d64846079e560bbe893c4c733b6':
  docs: change preview landing page top ribbon color

Change-Id: I7eede6be5a8960e7f2360656c66b136f519fb1bb