Upsides:
- Removing the render-blocking fonts.css allows the page to be visible while the
font is being loaded.
- The original WOFF2 files are smaller than the base64-encoded version in
fonts.css.
- Browsers may be smart enough to not download fonts that are not needed.
The only downside is that this requires the browser to make more requests - up
to 6 for all 6 font files. But this is not a problem with modern browsers.
