frontend: add Loading

frontend/src/App.tsx

@@ -5,6 +5,7 @@ import Hosting from './components/Hosting';
 import InitialSetup from './components/InitialSetup';
 import Program from './components/Program';
 import Snowflakes from './components/Snowflakes';
+import { FullScreenLoading } from './components/Loading';
 
 function App() {
   const [isNavOpen, setIsNavOpen] = useState(false);
@@ -15,6 +16,7 @@ function App() {
 
   return (
     <>
+      <FullScreenLoading/>
       <Snowflakes />
       <InitialSetup />