WEB: Adding new pandas website
The website can be seen here: https://datapythonista.github.io/pandas-web/

It's still pending that the designer polish the styles. And also the content can surely be improved with everybody's feedback. But I think will be useful to merge this once we iterate a bit on people's feedback, so we can start working on integrating the docs.

I'm coordinating with the devs of numpy/scipy, scikit-learn and matplotlib to see if we can reshare things implemented here. Ideally I'd like to have the `pysuerga.py` script in a separate repo (that's why it's not named pandas_web.py`), and also the layout and pages that can be shared (the code of conduct, the donate, the blog,...). For now I add everything here for simplicity, and will create a new project and have it as a dependency here if they are interested.

CC: @pandas-dev/pandas-core 