message: Fix and refactory DropdownExample to make site page works
diff: import { Button, Dropdown, DropdownDivider, DropdownItem, Tooltip } from 'bold-ui'
  -import React, { useRef, useState } from 'react'
  +import React, { useState } from 'react'
  export default function DropdownExample() {
  - const buttonRef = useRef<HTMLButtonElement>()
  -
  + const [buttonRef, setButtonRef] = useState<HTMLButtonElement>()
  const [open, setOpen] = useState(false)
  +
  const handleClick = () => setOpen(true)
  - const handleClose = () => {
  - setOpen(false)
  - buttonRef.current.focus()
  - }
  + const handleClose = () => setOpen(false)
  return (
  <>
  - <Button innerRef={buttonRef} onClick={handleClick} size='small' kind='primary' skin='outline'>
  + <Button innerRef={setButtonRef} onClick={handleClick} size='small' kind='primary' skin='outline'>
  Options
  </Button>
  