added some routes and pages, basic fixings for new design

client/src/App.tsx

client/src/components/ui/Button/button.scss

client/src/components/ui/Header/header.scss

client/src/components/ui/Header/index.tsx

client/src/components/ui/Navigation/index.tsx

client/src/components/ui/Navigation/navigation.scss

client/src/components/ui/Page/page.scss

client/src/components/ui/Sidebar/index.tsx

client/src/components/ui/Sidebar/sidebar.scss

client/src/components/ui/Task/index.tsx

client/src/components/ui/Task/task.scss

client/src/index.scss

client/src/pages/AppWrapper.tsx

client/src/pages/Home/index.tsx

client/src/pages/Login/index.tsx

client/src/pages/Projects/index.tsx

client/src/pages/Register/index.tsx

client/src/pages/Settings/index.tsx

client/src/pages/Settings/settings.scss

client/src/pages/Stats/index.tsx