Major: Added Authentication Functionality, interfaces with backend;

Added new styles to HomePage & VideoPage;
Added AuthContext to persist logged_in status;

frontend/src/components/Layout/Sidebar.tsx

@@ -0,0 +1,7 @@
+import React from "react";
+
+const Sidebar: React.FC = () => {
+  return <div></div>;
+};
+
+export default Sidebar;