switch to a Document trait and introduce Script/Head/Style/Meta components (#2635)

* switch to a Document trait and introduce Script/Head/Style/Meta components

* Fix desktop title

* Insert special elements into the head during the inital SSR render

* Make all head component attributes optional

* hydrate head elements

* improve the server streaming head warning

* Document fullstack head hydration approach

* deduplicate head elements by href

* move Link into head::Link

* document head components

* add meta and title examples

* Fix a few doc examples

* fix formatting

* Add title to playwright tests

* serde is optional on web, but it is enabled by hydrate

* remove leftover console log

packages/web/src/lib.rs

@@ -35,8 +35,10 @@ pub mod launch;
 mod mutations;
 pub use event::*;
 
-#[cfg(feature = "eval")]
-mod eval;
+#[cfg(feature = "document")]
+mod document;
+#[cfg(feature = "document")]
+pub use document::WebDocument;
 
 #[cfg(all(feature = "hot_reload", debug_assertions))]
 mod hot_reload;
@@ -60,8 +62,8 @@ pub async fn run(virtual_dom: VirtualDom, web_config: Config) -> ! {
 
     let mut dom = virtual_dom;
 
-    #[cfg(feature = "eval")]
-    dom.in_runtime(eval::init_eval);
+    #[cfg(feature = "document")]
+    dom.in_runtime(document::init_document);
 
     #[cfg(feature = "panic_hook")]
     if web_config.default_panic_hook {