[Marvin Klein (MarvinKlein1508)]

Pull Request

📖 Description

This PR adds a new section to the theme docs which explains to the user how he can setup the initial theme during the first page load. It provides an easy and copyable sample code block.

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

AI contribution declaration

AI assistance is allowed; fully AI-generated or autonomous pull requests without meaningful human review are not accepted. See the AI contribution policy.

• I have read and followed the AI contribution policy.
• I have personally reviewed and understood all changes, tested them, and take responsibility for this contribution.

Component-specific

• I have added a new component
• I have added Unit Tests for my new component
• I have modified an existing component
• I have validated the Unit Tests for an existing component

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