Mobile changes:
- there is now a button ("...") up in the title bar of any page with a right column (in the desktop view). Clicking it when on a mobile device will cause the page to scroll down to wherever the right column has moved to.
- restored the "Add it yourself!" button. Thanks to KidTDragon for reporting it.
- spruced up the Products/Parts tabs when on mobile, with fancy new icons and a cleaner, simpler look
