More browser compatibility fixes

[smrohrer]

• Eliminated vw and vh units so the site displays correctly in older browsers that don't support them.
• Refactored the JS for the expandable partner profile from ES6 so it works in older browsers.
• Changed the "banner form" on the "Submit Video" page to a scrollable div with a fixed height to prevent it from running into the footer in some cases. What are your thoughts on this design? Mobile behavior is same as before.

Elements are now sized and positioned correctly in:

• IE 9 (2011)
• Firefox 3.6 (2010)
• Chrome 15 (2011)
• Opera 11.6 (2011)
• Safari 5 (2010)

The remaining browser compatibility issue is support for pseudo-elements. The front page has white text with pseudo-element backgrounds.