Modified the `src` attribute of an `<img>` element in `app.tsx` to replace the previous image with a new icon located at "/assets/images/dd-button-icon.webp". This change enhances the visual representation of the application by using a more relevant image.
Updated the `App` component in `app.tsx` to include a new floating action button (Fab) linking to Digital Data. The button now features a transparent background and no box shadow, along with an image for improved visual representation. The `useScrollToTop` function remains unchanged but has a more streamlined implementation.
