Update NumFOCUS text on the website

[asmeurer]

From NumFOCUS:

We're very excited to share with you the new NumfOCUS logo! Please take this opportunity to add or update your project's website.

The language should say:

PROJECT is a fiscally sponsored project of NumFOCUS, a 501(c)(3) nonprofit that supports and promotes world-class, innovative, open source scientific software.

And then the logo, which should link to www.numfocus.org. I've attached both the horizontal and vertical versions so that you can use whichever fits better on your site.

Please ensure that you're using the proper capitalization: NumFOCUS

[asmeurer]

It's also possible to replace our DONATE NOW button with a direct donate widget. If you are interested in working on this let me know and I'll send you instructions (it's a long template, so I don't want to paste it on this issue).

[koulapure]