Video Hero: Add ability to upload a separate video for mobile#68

Allow two separate video formats to be used to not constrain or cut off video when in mobile format.

One format for desktop and one format for mobile.

We’ve just published this feature in the newest version of Cornerstone!

For a complete list of changes, check out Cornerstone’s changelog here: https://help.fluorescent.co/cornerstone/readme/changelog
And here’s where you’ll want to look for update instructions: https://cornerstone.help.fluorescent.co/theme-updates
If you have any questions or issues, please message our support team at help@fluorescent.co.

Thanks for your patience!