fix: export prop types from manifest/jsdoc

[jpoehnelt]

Export props and update README for instructions on JSX.

closes #51

[Copilot]

Pull Request Overview

This PR refactors the export of prop types by removing the legacy types file and introducing a new props file generated from the custom elements manifest. Key changes include:

• Updating src/index.ts and src/drive-picker/index.ts to export new prop type definitions.
• Removing src/drive-picker/types.ts and generating prop types in src/drive-picker/props.ts via a new build:props script.
• Adjusting custom-elements.json and README.md to reflect the new prop types and provide updated React/JSX usage instructions.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/index.ts	Updated export statements to include new prop interface types from "./drive-picker".
src/drive-picker/types.ts	Removed as prop types have been moved to the new props.ts file.
src/drive-picker/props.ts	New file that defines prop interfaces for DrivePicker components.
src/drive-picker/index.ts	Re-exports new prop types from props.ts.
scripts/props.ts	Added script to auto-generate the prop types from the custom elements manifest.
package.json	Added the build:props command and its configuration.
custom-elements.json	Updated to map prop type declarations to the new props file.
README.md	Added documentation for React/JSX usage with updated prop types.