Redesign the ProjectVenom website

Implement a brand new design, remove unused CSS rules and improve
README.md and website content.

The new design looks something like the following screenshots:

![venomone](https://cloud.githubusercontent.com/assets/3946887/5330306/9440eb80-7e32-11e4-87a3-00fb703b3100.PNG)

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![venomtwo](https://cloud.githubusercontent.com/assets/3946887/5330308/99f72f4e-7e32-11e4-83d2-13fb29b82e52.PNG)

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![venomthree](https://cloud.githubusercontent.com/assets/3946887/5330311/9f2a0a9a-7e32-11e4-8f05-6a22ab5b80cd.PNG)