chore(docs,components): make heading-level required and update docs

[schaertim]

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 22d7ba9ecc6d2cda2eda8a9de89b96c3d5b1a767

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

This PR includes changesets to release 17 packages

Name	Type
@swisspost/design-system-documentation	Major
@swisspost/design-system-components	Major
@swisspost/design-system-components-angular-workspace	Patch
@swisspost/design-system-components-react	Major
@swisspost/design-system-components-angular	Major
@swisspost/design-system-nextjs-integration	Patch
@swisspost/design-system-styles	Major
@swisspost/design-system-tokens	Major
@swisspost/design-system-intranet-header	Major
@swisspost/design-system-icons	Major
@swisspost/design-system-migrations	Major
@swisspost/design-system-styles-primeng	Major
@swisspost/design-system-demo	Patch
@swisspost/internet-header	Patch
@swisspost/design-system-intranet-header-workspace	Patch
@swisspost/design-system-styles-primeng-workspace	Patch
@swisspost/design-system-intranet-header-showcase	Patch

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

[swisspost-bot]

Related Previews

• https://preview-3383--swisspost-design-system-next.netlify.app

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud