[WIP][REF]: Refactor complete for right side, and advanced example

.../demo-components/dropzone-demo/AdvancedDropzoneCodeJS.jsx

src/pages/demo/AvatarDemoPage.tsx

src/pages/demo/DropzoneDemoPage.jsx

src/pages/demo/FileInputButtonDemoPage.tsx

src/pages/demo/FullScreenDemoPage.tsx

src/pages/download-page/FileDownloadPage.tsx

src/pages/file-icons/FileIconsPage.jsx

src/pages/getting-started/GettingStartedPage.jsx

src/pages/localization/LocalizationPage.jsx

src/pages/server-side/ServerSidePage.tsx

src/pages/types-page/TypesPage.jsx

src/pages/usage/UsagePage.jsx