v5 Browserslist updates

[mdo]

Fixes #41390.

This implements the suggested Browserslist I put in #41390 and adjusts the Browsers & Devices page to simplify and better represent the changes here. I remove all the tables here, they're just not necessary compared to the Browserslist page IMO. I've also moved that page lower down in the Getting Started docs section as it's really not that important to getting started these days.

/cc @julien-deramond