chore: remove demo app from v9

[gfellerph]

This removes the deprecated demo app from v9. To update the demo app, go to release/v8. Changes to this branch will build the demo app, the release workflow on main will then release the demo app.

[changeset-bot]

⚠️ No Changeset found

Latest commit: c515395

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[swisspost-bot]

Related Previews

• https://preview-6099--swisspost-design-system.netlify.app

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​storybook/​manager-api@​8.2.7

View full report

[alizedebray]

Please also remove the references to the demo app in these files:

• package.json
• renovate.json
• CONTRIBUTING.md
• packages/documentation/public/assets/versions.json
• .github/workflows/release-demo.yaml

[oliverschuerch]

Please also remove the references to the demo app in these files:

• package.json
• renovate.json
• CONTRIBUTING.md
• packages/documentation/public/assets/versions.json
• .github/workflows/release-demo.yaml

The versions.json should be updated automatically by the release workflow.

[sonarqubecloud]

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 SonarQube Cloud