Remove documentation files from docs directory

Deleted index.mdx, installation.mdx, quick-start.mdx, and meta.json from apps/site/content/docs. This removes the documentation content and associated metadata from the project.

Author: hotlong

apps/site/app/components/Logo.tsx

@@ -0,0 +1,16 @@
+import Image from 'next/image';
+
+export function Logo({ className }: { className?: string }) {
+  return (
+    <div className={`flex items-center gap-2 font-bold ${className}`}>
+      <Image 
+        src="/logo.svg" 
+        alt="Object UI Logo" 
+        width={32} 
+        height={32} 
+        className="h-8 w-8"
+      />
+      <span>Object UI</span>
+    </div>
+  );
+}

apps/site/app/docs/layout.tsx

@@ -1,10 +1,11 @@
 import { source } from '@/lib/source';
 import type { ReactNode } from 'react';
 import { DocsLayout } from 'fumadocs-ui/layouts/docs';
+import { Logo } from '../components/Logo';
 
 export default function Layout({ children }: { children: ReactNode }) {
   return (
-    <DocsLayout tree={source.pageTree} nav={{ title: 'Object UI' }}>
+    <DocsLayout tree={source.pageTree} nav={{ title: <Logo /> }}>
       {children}
     </DocsLayout>
   );

apps/site/app/page.tsx

@@ -1,11 +1,12 @@
 import Link from 'next/link';
 import { HomeLayout } from 'fumadocs-ui/layouts/home';
+import { Logo } from './components/Logo';
 
 export default function HomePage() {
   return (
     <HomeLayout
       nav={{
-        title: 'Object UI',
+        title: <Logo />,
         url: '/',
       }}
       githubUrl="https://github.com/objectstack-ai/objectui"