chore(documentation, styles): remove modal bootstrap component and its CSS

[leagrdv]

📄 Description

Please include a summary of the changes made in this PR.

🚀 Demo

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📝 Checklist

• ✅ My code follows the style guidelines of this project
• 🛠️ I have performed a self-review of my own code
• 📄 I have made corresponding changes to the documentation
• ⚠️ My changes generate no new warnings or errors
• 🧪 I have added tests that prove my fix is effective or that my feature works
• ✔️ New and existing unit tests pass locally with my changes

[changeset-bot]

🦋 Changeset detected

Latest commit: e813c9b

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

This PR includes changesets to release 12 packages

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

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[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

[swisspost-bot]

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