fix: Don't use localStorage in SSR

Author: jimmed

components/Editor.js

@@ -5,7 +5,10 @@ import { CodeSandbox } from "./CodeSandbox";
 const Editors = { Glitch, CodeSandbox };
 
 export const useLocalStorage = (key, defaultValue) => {
-  const [state, setState] = useState(() => localStorage[key] ?? defaultValue);
+  const [state, setState] = useState(
+    () =>
+      typeof localStorage !== "undefined" || (localStorage[key] ?? defaultValue)
+  );
   useEffect(() => {
     if (state != null && key != null) {
       localStorage[key] = state;