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/liveview/src/lib.rs

@@ -85,7 +85,7 @@ fn handle_edits_code() -> String {
     .replace("export", "");
     while let Some(import_start) = interpreter.find("import") {
         let import_end = interpreter[import_start..]
-            .find(|c| c == ';' || c == '\n')
+            .find([';', '\n'])
             .map(|i| i + import_start)
             .unwrap_or_else(|| interpreter.len());
         interpreter.replace_range(import_start..import_end, "");