[REF]: Remove most of the unused code.

package-lock.json

package.json

src/components/MainMenu/MainMenuSideBar.tsx

src/components/MainPage/GettingStarted.jsx

src/components/MainPage/MainFooter.jsx

src/components/MainPage/MainNavBar.jsx

...nents/MainPage/MainRight/FileMosaicImageVideoPreviews.tsx

src/components/RightMenu/RightMenu.tsx

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

...ts/demo-components/dropzone-demo/AdvancedDropzoneDemo.jsx

...nts/demo-components/dropzone-demo/BasicDropzoneCodeJS.jsx

...nents/demo-components/dropzone-demo/DemoDropzoneRiple.jsx

...demo-components/filemosaic-demo/BasicFileMosaicCodeJS.jsx

...demo-components/filemosaic-demo/CodeJSFileMosaicBasic.jsx

...s/demo-components/filemosaic-demo/DemoFileMosaicBasic.jsx

...o-components/filemosaic-demo/DemoFileMosaicImgPreview.tsx

...components/demo-components/main-page/DropzoneMainPage.jsx

src/components/getting-started/Overview.tsx

src/components/layout-pages/MainLayoutPage.jsx

src/components/show-demo-code/ShowDemoCode.tsx