This pull request introduces several changes to modernize the codebase and improve compatibility with ES modules. The most significant updates include switching from CommonJS to ES module syntax, adding the "type": "module" field in package.json, and updating dependencies. Additionally, import paths across multiple files have been updated to explicitly include .js extensions for better module resolution.

Modernization of module system:

• .babelrc.js: Replaced module.exports with export default to align with ES module syntax.
• package.json: Added "type": "module" to indicate the use of ES modules.
• package.json: Removed the creation of package.json files with "type" fields during build scripts, as the "type": "module" field now applies globally.

Dependency updates:

• package.json: Updated @restart/ui to version ^2.0.0-beta.5 and dom-helpers to version ^6.0.1 for improved functionality and compatibility.

Import path updates:

• Updated all import paths across multiple files (e.g., src/AbstractModalHeader.tsx, src/Accordion.tsx, src/Alert.tsx, etc.) to include .js extensions explicitly, ensuring compatibility with ES modules. Examples include:
  • src/AbstractModalHeader.tsx: Changed imports for CloseButton and ModalContext to include .js extensions.
  • src/Accordion.tsx: Updated imports for AccordionBody, AccordionButton, AccordionCollapse, and others to include .js extensions.
  • src/Alert.tsx: Updated imports for AlertHeading, AlertLink, Fade, and others to include .js extensions.