fix: disable concurrency

svelte.config.js

@@ -52,15 +52,7 @@ const config = {
             $markdoc: './src/markdoc'
         },
         prerender: {
-            concurrency: 16,
+            concurrency: 1
-            handleHttpError: ({ path, message }) => {
-                if (path.startsWith('/threads/')) {
-                    console.warn('Flaky thread build error.')
-                    return;
-                }
-
-                throw new Error(message);
-            }
         }
     }
 };