docs: remove placeholder docs (#732)

Author: Timeless0911

website/docs/en/api/_meta.json

@@ -7,12 +7,6 @@ Specify whether to bundle the library, which is known as bundle mode when `bundl
 
 See [bundle / bundleless](/guide/basic/output-structure#bundle--bundleless) for more details.
 
-::: warning
-
-The bundleless mode is not fully supported yet, and some features like [assets](/guide/advanced/assets) may not work properly.
-
-:::
-
 ## Set entry
 
 We should specify the entry file for the build.