WIP: Web typography presets

[jamesmockett]

What are you changing?

Implements updated typography presets for web. This is a draft and only includes presets for headline styles.

Each preset is defined as an individual token:

"headlineMedIta24": {
  "$value": {
    "fontFamily": "{typography.fontFamily.headline}",
    "fontSize": "{typography.fontSize.24}",
    "lineHeight": "{typography.lineHeight.tight}",
    "fontWeight": "{typography.fontWeight.medium}",
    "fontStyle": "italic"
  }
}

These can then be used via the typography export:

const headline = css`
  ${typography.headlineMedIta24};
`;

Each preset encapsulates a complete typographic style so there are no options.

[changeset-bot]

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Latest commit: e43e354

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[github-actions]

Tip

Once this PR is ready to go, add the run_chromatic label to run the Chromatic tests.

This saves us a lot of money by not running the tests before we need them.

[jamesmockett]

Closing as this has served its purpose of being a place to try out ideas and get feedback. Now we've established an approach to implementing the new presets this will be done in a series of smaller, incremental PRs.