Cup Page Overwork (+ general Bugfixes)

General:
- Custom Media Query for the breakpoint where the top bar switches to
the mobile menu (+ visibility classes for this query)
added JS Plugins:
- jquery.kinetic.js -> dragscrolling
- jquery.mousewheel.js -> horizontal scrolling with mousewheel
Cup Page:
- Section Header: color & padding
- Challenges: date-color & winner-bg-color
- Ranking: first place icon & link on name too
- rewritten with rem-calc and variables for simple customization