Fix IE Compatibility & Misc Layout Tweaks

Main part of this PR is IE8+ compatibility. IE8 and IE9 will get a degraded experience - it won't include the fancy scrolling. Instead it is just a simple scrolling website.

IE10 and other modern browsers get the full fanciness!

I also optimized and cleaned up any unused images and JS build artefacts.

Also included is a CSS & HTML refactor, mainly removing lots of IDs and classes applied to paragraphs and images - instead applying them to more generic containers and names.