Revert "docs: Add Videos section to N Preview landing page"

Reverting this change since I don't have confirmation that the videos will ship by 10am on 6/15.

This reverts commit a1f02ff4e439d9de58ed4a788a52c2f73cfc36ce.

Change-Id: I854c589436bcc4e146770415898996826f552b21
2 files changed