docs: add copy subscriber button (#12405)

* docs: add copy subscriber button

* re-generate

* fixes + update copy button

www/packages/docs-ui/src/components/Heading/H2/index.tsx

@@ -5,7 +5,7 @@ import React from "react"
 import { CopyButton, Link } from "@/components"
 import { useHeadingUrl, useLayout } from "../../.."
 
-type H2Props = React.HTMLAttributes<HTMLHeadingElement> & {
+export type H2Props = React.HTMLAttributes<HTMLHeadingElement> & {
   id?: string
   passRef?: React.RefObject<HTMLHeadingElement | null>
 }