Proposal for website design

[ricardoV94]

@twiecki

Installation instructions: We could add this, like scikit-learn does. But they are also on the home page. Correct me if I’m wrong but I think we don’t really currently have an installation page because we have 3 different installation instructions and I think that’s a good enough solution for now to link from the home page.

We could add a thingy with the 3 tabs, that I think the new docs website supports