Removing getting started and how to guides from API references.

Removing getting started and how to guides from API references.

Developer content will be available on iotivity.org going forward, so
there is no need for these files in the API docs code. Direct links were
added to the Home.txt for the iotivity.org/documentation and
wiki.iotivity.org sites.

IOT-218 - Removed the "M1 release" text in title from Doxygen output
IOT-219 - Remove "About OIC" , "Programmer's guide" and "how to"

Change-Id: I28e26328a82cb6ff037ce451a5ed6fee368ad635
Signed-off-by: mshaver <michael.r.shaver@intel.com>
(cherry picked from commit 6a6e69ce6c64b2f7ec85cf2e4c28dd2558192aef)
Reviewed-on: https://gerrit.iotivity.org/gerrit/201
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sudarshan Prasad <sudarshan.prasad@intel.com>