Patch set 5: Updated R5 RN.
Patch set 4: Resolved merge confict.
Patch set 3: Removed R5 install guides.
Local docs build is successful.
Patch set 2: Added R6 install guides.
Removed R1-R4 install guides.
R5 will be removed next patch set.
Updated main docs landing page with R5 links.
Installation index page: promoted R5 to supported, moved R4 to
archive section, created R6 (latest) section.
Change-Id: Ic0e0409f2385a9a6f29b83a2eda12753ea4ac1a3
Signed-off-by: MCamp859 <maryx.camp@intel.com>