Move keyfeatures to a grid of cards

[jarrodmillman]

Building on functionality from the v0.11 release. The keyfeature panel for the homepage will be removed in a future theme release. This is part of our large effort to adopt styling from pydata-sphinx-theme where possible. It also makes the frontpage behave more like the other pages.

You can see more examples of cards (in a grid) here:

• https://theme.scientific-python.org/shortcodes/#grid

This will also make it easier to modify your project homepage without having to override layouts/index.html.

The styling is a little different than before due to adopting pydata-sphinx-theme styling. But that styling is being used on many community sites and is being reviewed for accessibility.

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[tupui]

Thanks @jarrodmillman all good and it looks nice too 😃