Fix the index.html page

- Changed PistonDevelopers.github.io to just Piston in the titles (which is more readable)
- Updated the site description to reflect the main piston repo's description
- Fixed the indentation on the main content section
Updated README file

Fixed the README title and added links to the website and source code.
Merge pull request #15 from Apointos/patch-1

General website fixes