refactor: Enforce prettier configuration

[MoritzWeber0]

Enforce prettier on SCSS, JS, HTML and MD files.

The enforcement of line-breaks is disabled by default since it breaks many Markdown files and needs manual reviewing. We should consider this option for a future PR. It can be enabled with:

    {
      "files": ["*.md"],
      "options": {
        "proseWrap": "always",
      }
    }

[github-actions]

Hi there! 👋

Thank you for your contribution to the FIP Guide! 🚀
We appreciate your effort in making rail staff travel information more accessible. 🚄

Checklist before merging:

• Added a description to the Pull Request
• Checked the License of new pictures (non-commercial use without attribution)
• Modified content in English
• Modified content in German
• Modified content in French

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