chore: add docs site

docs/faq/performance.md

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+# Any performance considarations?
+
+Short answer, no
+
+On the client, `vue-meta` batches DOM updates using [`requestAnimationFrame`](https://developer.mozilla.org/en-US/docs/Web/API/window/requestAnimationFrame). It needs to do this because it registers a Vue mixin that subscribes to the [`beforeMount`](https://vuejs.org/api/#beforeMount) lifecycle hook on all components in order to be notified that renders have occurred and data is ready. If `vue-meta` did not batch updates, the DOM meta info would be re-calculated and re-updated for every component on the page in quick-succession.
+
+Thanks to batch updating, the update will only occurr once - even if the correct meta info has already been compiled by the server. If you don't want this behaviour, see below.
+
+:::tip Improvements since v2.0
+Previous versions of vue-meta injected lifecycle hooks from the global mixin on all components on the page. Also when refreshing metadata it checked all components on the page
+
+Since v2.0 runtime performance should be improved due to:
+- the global mixin injects just a `beforeCreate` lifecycle hook, other hooks are only added for components which define `metaInfo`
+- we track component branches with `vue-meta` components which means that when refreshing metadata we can skip branches without metaInfo
+
+:::