initial App/Nav setup

frontend/src/components/DocsGPT.tsx

@@ -0,0 +1,3 @@
+export default function DocsGPT() {
+  return <div>Docs GPT</div>;
+}

frontend/src/components/Navigation.tsx

@@ -0,0 +1,17 @@
+import React, { useState } from 'react';
+
+function MobileNavigation() {
+  return <div>Mobile Navigation</div>;
+}
+
+function DesktopNavigation() {
+  return <div>Desktop Navigation</div>;
+}
+
+export default function Navigation({ isMobile }: { isMobile: boolean }) {
+  if (isMobile) {
+    return <MobileNavigation />;
+  } else {
+    return <DesktopNavigation />;
+  }
+}