moved 'fork me on git' to JavaScript

The 'fork me on git' is now a native part of NOVA. Ads random colored
banner
Fork on GitHub no longer part of NOVA

Separated the script for adding "Fork on GitHub" element from NOVA.
Corrected errors

Corrected some forgotten changes which interrupted the script. It should
work better now...
Merge pull request #9 from Kirens/forkGit

moved "fork me on git" to JavaScript