Optimize for mobile device screens

[Varunram]

Right now, the platform is meant to be accessible from a pc / laptop, meaning that multiple UI elements don't look great when viewed on a mobile screen. Given that a majority of traffic these days is from mobile devices (might not be the case for opensolar, which is an investment platform), we must make sure that the pages look nice when viewed on a mobile screen to give users a sense of confidence in investing on the platform. In the future, we could write a react-native app which could be ported to multiple platforms.