Don't allow back when on top

src/main.rs

@@ -577,19 +577,23 @@ fn handle_relative_connection(
         .map(|(path, _)| path)
         .unwrap_or_default();
 
+    let title = relative_path
+        .rsplit_once('/')
+        .map_or(relative_path, |(_, title)| title);
+
+    let back = !title.is_empty();
+
     let section = |stream: &mut TcpStream| {
         let _ = writeln!(stream, "<hr>");
+        if back {
             let _ = writeln!(stream, "<a href=\"/{parent_path}\">&lt;&lt; Back</a>");
+        }
     };
 
     let _ = writeln!(stream, "<p>👁️{visits} 💖️{up} 💔️{down}</p>");
 
     section(&mut stream);
 
-    let title = relative_path
-        .rsplit_once('/')
-        .map_or(relative_path, |(_, title)| title);
-
     fn entry_handler<W: Write>(
         path: &Path,
         relative_path: &str,
@@ -635,7 +639,7 @@ fn handle_relative_connection(
         }
     }
 
-    if !title.is_empty() {
+    if back {
         let _ = writeln!(stream, "<h1>{title}</h1>");
     }