Refactor dees-input-fileupload component and styles

- Updated demo.ts to enhance layout and styling, including renaming classes and adjusting spacing.
- Removed unused template rendering logic from template.ts.
- Simplified index.ts by removing the export of renderFileupload.
- Revamped styles in styles.ts for improved design consistency and responsiveness.
- Enhanced file upload functionality with better descriptions and validation messages.

ts_web/elements/dees-input-fileupload/index.ts

@@ -1,3 +1,2 @@
 export * from './component.js';
 export { fileuploadStyles } from './styles.js';
-export { renderFileupload } from './template.js';