docs: Add reference docs for react hook form (#242)

apps/www/pages/reference/_meta.tsx

@@ -1,4 +1,11 @@
 export default {
+  "-- integrations": {
+    title: "Integrations",
+    type: "separator",
+  },
+  integrations: {
+    display: "children",
+  },
   "-- primitives": {
     title: "Primitives",
     type: "separator",

apps/www/pages/reference/integrations/_meta.tsx

@@ -0,0 +1,3 @@
+export default {
+  "react-hook-form": "React Hook Form",
+};

apps/www/pages/reference/integrations/react-hook-form.mdx

@@ -0,0 +1,37 @@
+---
+title: "@assistant-ui/react-hook-form"
+description: A React Hook Form integration for @assistant-ui.
+--- 
+
+## API Reference
+
+### `useAssistantForm`
+
+Drop-in replacement hook for `useForm` that adds support for `@assistant-ui/react`.
+
+```diff
+- import { useForm } from "react-hook-form";
++ import { useAssistantForm } from "@assistant-ui/react-hook-form";
+
+- useForm({
++ useAssistantForm({
+    ...
+  });
+```
+
+{/** TODO document assistant.tools property */}
+
+### `formTools`
+
+The set of tools to use with `useAssistantForm`, useful for runtimes that do not support client-side tool definitions (i.e. Vercel AI SDK).
+
+```tsx {1, 5-7}
+import { formTools } from "@assistant-ui/react-hook-form";
+
+const result = await streamText({
+  ...
+  tools: {
+    ...formTools,
+  }
+});
+```

apps/www/pages/reference/primitives/composition.mdx

@@ -2,8 +2,6 @@
 title: Composition
 ---
 
-{/** https://github.com/liveblocks/liveblocks/blob/main/LICENSE */}
-
 import { Code } from "@radix-ui/themes";
 
 `assistant-ui` primitives are composable. This means that all props are forwarded, classes are merged, and event handlers are chained.