[cvp-web] Add initial CVP Portal homepage content for release

[cvp-web] Add initial CVP Portal homepage content for release

JIRA: DOVETAIL-563

The CVP portal homepage needs to be modified to support launch
activities. An initial iteration between OPNFV marketing has occurred.
Attached is a deck that outlines a basic left navigation menu and home
content.
We can focus on creating the left navigation and content outlined on
slide 7. The links for the left navigation aren't all flushed out.
Please leave Release Information/CVP Registry link href's blank for now
until we define content for those pages.

Change-Id: I84b8cfb996d336ef666d5a5f6aaabc0d5eebc37b
Signed-off-by: grakiss <grakiss.wanglei@huawei.com>