Minor edits

Removed a piece of code commented and edited the README.md file
Bug fixes and optimization

*Now the Pi Number written in the screen will wrap and do a break so it
can be shown correctly
*The code is now more optimized
New features

Now when a pi digit is not correct, it will also show the correct one.
There's also other stuff now... Check out the js source code ;-)
Updated README.md

Updated the demo link at the README.md file.
Bug fixes

Fixed when every key would delete the introduction text in the blue box.
Another bug fix
New way to restart the game

Now to restart the game you can press Shift+R instead of reloading the
whole page to reset and restart the game.
Optimized
Bug fix for optimization