Remove Video embeds from front page

These won't work because the ASF web server is setting
a CSP that won't allow iframes from outside.
We will have to host these videos ourselves somehow.

Change-Id:If17ec8dbd1de435c9a0caedf4dab7ae6e8e2a5b2
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/incubator-asterixdb-site/+/19071
Reviewed-by: Ian Maxon <imaxon@apache.org>
2 files changed