Add some front page content

Created by: selbekk

Preview: https://create-react-app-stngeqjqos.now.sh

This pull request adds some content to the front page, and fixes a design faux-pas with the mobile navigation.

This doesn't need to be the final content, of course, but it's a lot better than not having anything

I created the update screenshot with carbon, which can be updated quite easily later if we want.

Addresses #5238 (closed)

requested review from @root

requested review from @root

added CLA Signed label

mentioned in issue #5238 (closed)

Merged by: amyrlam at 2018-10-11 16:51:00 UTC

closed