more fullstack cleanups: loaders serialize, ServeConfig only (#4785)

* some opinionated cleanups in dioxus-server

* add serialize to loader

* add `result` to Resource

* clippy

* fix

* writable memos, resources, `onmount`, `.pending`, and `.value()` on actions

* fix compile issues

* fix typo

packages/html/src/events/mounted.rs

@@ -278,6 +278,8 @@ impl_event! [
     onmounted
 ];
 
+pub use onmounted as onmount;
+
 /// The MountedResult type for the MountedData
 pub type MountedResult<T> = Result<T, MountedError>;