Add fluid type scale and font-face declarations

[greatislander]

Is your feature request related to a problem?

We will want to bundle the fonts required for this design system, and add @font-face declarations for them. We'll also need a fluid type scale.

Describe the solution you'd like

1. Used https://gwfh.mranftl.com/fonts to retrieve the two fonts and CSS @font-face declarations for them. Structurally, the fonts should be referenced using relative URLs and the fonts directory should be at the same level as the css directory:

├── css
│   ├── fonts.css // References ../fonts/webfont.woff2 in the @font-face rules.
├── fonts
│   ├── webfont.woff2

2. For the fluid type scale, we'll want to use Utopia again.

Describe alternative solutions you've considered

Not applicable.

Additional context or notes

Not applicable.