message: docs: improve text about web fonts
diff: @@ -4,7 +4,9 @@ import { Meta } from '@storybook/addon-docs/blocks'
  # Theming
  -To use a Roboto's font you need to import it:
  +## Webfont
  +
  +You also need to add a `Roboto`, just call it in your `<head>`.
  ```html
  <link
  @@ -14,6 +16,10 @@ To use a Roboto's font you need to import it:
  />
  ```
  +If you want to use another font, you need to change a CSS variable `--font-family`.
  +
  +## CSS Variables
  +
  You can create your own theme, just override the variables in your stylesheet `:root`:
  ```css
  