Update git-edmunds.html

Changed layout on web page(put forms into <div> and centered) and added VIN lookup. The code now retrieves trade-in value instead of private party value. VIN lookup does not always work, apparently something to do with Edmunds database, but not sure. I am still working on it. Lastly, I added some disabled text areas to show year, make, and model of car when using VIN to lookup vehicle information.