major update

src/components/Preloader/Preloader.css

src/components/Preloader/Preloader.js

src/components/charts/Chart.js

src/components/main/Main.css

src/components/main/Main.js

src/components/navbar/Navbar.css

src/components/navbar/Navbar.js

src/components/sidebar/Sidebar.css

src/components/sidebar/Sidebar.js

src/construction.js

src/fire.js

src/hooks/useFolder.js

src/index.css

src/index.js

src/logo.svg

src/reportWebVitals.js

src/setupTests.js