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/router/src/components/link.rs

@@ -198,6 +198,7 @@ impl Debug for LinkProps {
 /// #     r#"<a href="/" dioxus-prevent-default="" class="link_class active" rel="link_rel" target="_blank" aria-current="page" id="link_id">A fully configured link</a>"#
 /// # );
 /// ```
+#[doc(alias = "<a>")]
 #[allow(non_snake_case)]
 pub fn Link(props: LinkProps) -> Element {
     let LinkProps {