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/interpreter/src/js/hash.txt

@@ -1 +1 @@
-6628058622237003340
+[6449103750905854967, 12029349297046688094, 14626980229647476238, 8716623267269178440, 5336385715226370016, 14456089431355876478, 3589298972260118311, 2745859031945642653, 5638004933879392817]