fix(typography): update typography for headings

[gfellerph]

Update font weight and responsive size of headings and provide better typography examples in the demo app.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 05cdec7aa5d97b7f4e6ed6ce23efcc7e1bb84a27

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | --------------------- | ----- | | @swisspost/web-demo | Patch | | @swisspost/web-styles | Major |

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions[bot]]

🚀 Preview environment ready: https://preview-115--swisspost-web-frontend.netlify.app/

[gfellerph]

@swisspost/design, this PR can be reviewed at https://preview-115--swisspost-web-frontend.netlify.app/#/bootstrap-samples/typography.

[wueestd]

Not sure if we have even a even larger font on viewport >1280px, but not sure. do you know @rouvenpost?

[github-actions[bot]]

🚀 Preview environment ready: https://preview-115--swisspost-web-frontend.netlify.app/

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[github-actions[bot]]

🚀 Preview environment ready: https://preview-115--swisspost-web-frontend.netlify.app/

[github-actions[bot]]

🚀 Preview environment ready: https://preview-115--swisspost-web-frontend.netlify.app/