feat(api): keep render_html out of prelude

Keep the beginner prelude on the short render helper while leaving render_html/lower_html as explicit compatibility aliases.

req: dx/006

slhx/src/lib.rs

@@ -94,7 +94,7 @@ pub mod prelude {
         CssClasses, Effect, EventName, Form, FormModel, FormValue, Handle, IntoEffect, KeyedSlot,
         ParamName, SafeHtml, Slot,
     };
-    pub use crate::{render, render_html};
+    pub use crate::render;
     pub use slhx_derive::{app, component, form, handler, surface};
 }