Landing page

[ascariandrea]

For the first release we need a landing page with the following blocks (not definitive):

• [ ] top menu
• [ ] heading: a sentence with image/graph that shows how bad we're doing - it could be something like the waming stripes or a graph that shows the increase of the temperature, etc...
• [ ] project mission
• [ ] open government
• [ ] open source
• [ ] crowdfund
• [ ] footer