fix(header): removing header

app.jsx

@@ -1124,64 +1124,12 @@ function App() {
 
   return (
     <div>
-      {/* Nav */}
-      <nav className="nav">
-        <a href="#" className="nav-brand">
-          <img src={(typeof window !== 'undefined' && window.__HF_LOGO) || "assets/hf-logo.png"} alt=""/>
-          <span className="wordmark">Hugging Face</span>
-        </a>
-        <div className="nav-links">
-          <a href="#">Models</a>
-          <a href="#">Datasets</a>
-          <a href="#" style={{background:'var(--bg-3)', color:'var(--fg-1)'}}>Spaces</a>
-          <a href="#">Posts</a>
-          <a href="#">Docs</a>
-        </div>
-        <div className="nav-spacer"/>
-        <input className="nav-search" placeholder="Search models, datasets, users..." readOnly/>
-        <div className="nav-right">
-          <button className="nav-btn">Sign In</button>
-          <button className="nav-btn primary">Sign Up</button>
-        </div>
-      </nav>
-
-      {/* Space header */}
-      <div className="space-header">
-        <div className="space-header-inner">
-          <div>
-            <div className="space-breadcrumb">
-              <a href="#">lerobot</a>
-              <span className="sep">/</span>
-              <a href="#" style={{color:'var(--fg-1)'}}>video-benchmark</a>
-              <span className="sep">·</span>
-              <span>Space</span>
-            </div>
-            <div className="space-title">
-              🎬 Video encoding & decoding benchmark
-            </div>
-            <div className="space-meta">
-              <span className="pill">SPACE</span>
-              <span className="chip">🟢 Running</span>
-              <span className="chip">Static</span>
-              <span className="chip">Apache-2.0</span>
-              <span style={{color:'var(--fg-3)'}}>Updated 2 days ago</span>
-            </div>
-          </div>
-          <div className="space-actions">
-            <button className="like-btn">♥ Like <span className="count">217</span></button>
-            <button className="nav-btn">App</button>
-            <button className="nav-btn">Files</button>
-            <button className="nav-btn">Community</button>
-          </div>
-        </div>
-      </div>
-
       {/* Main */}
       <div className="page">
         {/* Hero */}
         <section className="hero" style={heroClass}>
           <div>
-            <span className="hero-tag"><span className="dot"/> Open benchmark · Updated daily</span>
+            <span className="hero-tag"><span className="dot"/> Open benchmark</span>
             <h1>Which video codec belongs in your robotics dataset?</h1>
             <p className="subtitle">
               Encode with h264, HEVC, or AV1. Decode with PyAV, torchcodec, or video_reader. Across four LeRobot datasets, {ALL_ROWS.length.toLocaleString()} configurations tell you exactly what you trade for what.