New front page

[foolip]

We're planning a new front page for wpt.fyi.

The front page should highlight important parts of the site that most users will want to navigate to, and also be a place where new things can be highlighted.

I think a grid of cards could work, with cards like:

• Show Results, a widget where it's possible to check/uncheck which browsers to show, before clicking through to /results. The widget should show Chrome, Edge, Firefox and Safari, with Chrome, Firefox and Safari checked by default.
• Interop 2022, a miniature version of the scores at the top of https://wpt.fyi/interop-2022 linking through to that view
• Browser Specific Failures, a mini graph linking through to a dedicated view for that
• Getting Started, some nice words linking through to https://web-platform-tests.org/

Perhaps we could also have news on the front page, although that's not content that currently exists.