Landing page restructured

The detailed description on ONAP and the architecture figure have been removed form the landing page.
The table on documentation types has been added to the landing page.

Issue-ID: DOC-353

Change-Id: Iadc0aa94bb3db62d7a0f73924a7afdd34889a6f7
Signed-off-by: Noemi Wagner <noemi.wagner@nokia.com>
2 files changed