Added graph reset functionality. Pressing 'r' resets graph orientation.
Updated README and also added more help content to main page.
Inverted the arrow keys panning behaviour so that it makes more sense to an unsuspecting user.
Example- Pressing <right>, makes the viewer shift to the right so the fixed graph moves to the left.
CSS Changes
- Shfited overlay help to the left, added overflow:scroll to help div,
- Set overflow:hidden for body