Standardize Code Style with ESLint and Prettier

[timDeHof]

To maintain a consistent code style and improve code quality, we need to ensure ESLint and Prettier are properly set up and configured. After setting up, the entire codebase should be formatted according to these tools to standardize the coding style.

Acceptance Criteria:

• Set up and configure ESLint and Prettier.
• Run ESLint and Prettier on the entire codebase.
• Fix any linting issues that arise.
• Document the coding standards in the contributing guide.